Note 7 - Stock-based Compensation (Tables)
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12 Months Ended |
Dec. 31, 2017 |
Notes Tables |
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Share-based Compensation, Stock Options, Activity [Table Text Block] |
| | | | | | | | | | | | | Outstanding balance at December 2 8, 2014
| | | 817,212 | | | $ | 2.07 | | | | | | | | | | Options granted | | | — | | | $ | — | | | | | | | | | | Options forfeited | | | (95,431 | ) | | $ | 2.03 | | | | | | | | | | Options expired | | | (66,667 | ) | | $ | 3.11 | | | | | | | | | | Options exercised | | | — | | | $ | — | | | | | | | | | | Outstanding balance at January 3, 2016
| | | 655,114 | | | $ | 1.98 | | | | | | | | | | Options granted | | | 387,255 | | | $ | 1.33 | | | | | | | | | | Options forfeited | | | (363,847 | ) | | $ | 1.46 | | | | | | | | | | Options expired | | | (61,756 | ) | | $ | 3.46 | | | | | | | | | | Options exercised | | | — | | | $ | — | | | | | | | | | | Outstanding balance at January 1, 2017
| | | 616,766 | | | $ | 1.82 | | | | | | | | | | Options granted | | | 1,468,716 | | | $ | 1.29 | | | | | | | | | | Options forfeited | | | (40,722 | ) | | $ | 1.80 | | | | | | | | | | Options expired | | | (174,007 | ) | | $ | 1.89 | | | | | | | | | | Options exercised | | | — | | | $ | — | | | | | | | | | | | | | | | | | | | | | | | | | | | Outstanding balance at December 31, 2017
| | | 1,870,753 | | | $ | 1.39 | | | $ | 61 | | | | 8.6 | | | | | | | | | | | | | | | | | | | Exercisable balance at December 31, 2017
| | | 324,696 | | | $ | 1.86 | | | $ | — | | | | 5.1 | |
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Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
| | | | | | | | | | Black-Scholes weighted-average assumptions | | | | | | | | | | | | | | | | | | | | | | | | | | Expected dividend yield | | | N/A | | | | 0.0 | % | | | N/A | | Expected volatility | | | N/A | | | | 43.8 | % | | | N/A | | Expected forfeiture | | | N/A | | | | 29.0 | % | | | N/A | | Risk-free interest rate | | | N/A | | | | 1.33 | % | | | N/A | | Expected stock option life in years
| | | N/A | | | | 4.0 | | | | N/A | | | | | | | | | | | | | | |
Weighted-average stock option fair value per
| | $ | N/A | | | $ | 0.48 | | | $ | N/A | |
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Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block] |
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Weighted average exercise price
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Weighted average exercise price
| | 355,881 | | | | 1.80 | | | | 200,977 | | | | 1.80 | | 50,000 | | | | 2.02 | | | | 50,000 | | | | 2.02 | | 50,000 | | | | 2.19 | | | | 50,000 | | | | 2.19 | | 71,156 | | | | 1.33 | | | | 23,719 | | | | 1.33 | | 1,007,787 | | | | 1.23 | | | | — | | | | — | | 335,929 | | | | 1.26 | | | | — | | | | — | | 1,870,753 | | | $ | 1.39 | | | | 324,696 | | | $ | 1.86 | |
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Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] |
| | | | | | | | | | Binomial Model weighted-average assumptions | | | | | | | | | | | | | | | | | | | | | | | | | | Stock Price | | | N/A | | | | 1.34 | | | | N/A | | Expected volatility | | | N/A | | | | 42.2 | % | | | N/A | | Expected forfeiture | | | N/A | | | | 29.0 | % | | | N/A | | Risk-free interest rate | | | N/A | | | | 0.60 | % | | | N/A | | | | | N/A | | | | 3.0 | | | | N/A | | | | | | | | | | | | | | | Weighted-average RSU fair value per award granted | | $ | N/A | | | $ | 0.42 | | | $ | N/A | |
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Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] |
| | | | | | | | | | | | | | | | | | | | | | | Outstanding balanc e at December 28, 2014
| | | 520,433 | | | $ | 1.94 | | | | | | RSU granted | | | 91,818 | | | $ | 1.47 | | | | | | RSU forfeited | | | (64,908 | ) | | $ | 1.89 | | | | | | RSU converted into common shares | | | (67,779 | ) | | $ | 1.80 | | | | | | | | | | | | | | | | | | | Outstanding balance at January 3, 2016
| | | 479,564 | | | $ | 1.88 | | | | 1.51 | | | | | | | | | | | | | | | RSU granted | | | 987,764 | | | $ | 0.84 | | | | | | RSU forfeited | | | (352,077 | ) | | $ | 0.87 | | | | | | RSU converted into common shares | | | (25,125 | ) | | $ | 1.99 | | | | | | | | | | | | | | | | | | | Outstanding balance at January 1 , 2017
| | | 1,090,126 | | | $ | 1.22 | | | | 1.01 | | | | | | | | | | | | | | | RSU granted | | | 229,950 | | | $ | 1.50 | | | | | | RSU forfeited | | | (261,606 | ) | | $ | 0.89 | | | | | | RSU converted into common shares | | | (482,447 | ) | | $ | 1.72 | | | | | | | | | | | | | | | | | | | Outstanding balance at December 31, 2017
| | | 576,023 | | | $ | 1.13 | | | | 1.84 | |
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Performance Shares [Member] |
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Notes Tables |
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Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
| | | | | | | | | | Binomial Model weighted-average assumptions | | | | | | | | | | | | | | | | | | | | | | | | | | Stock Price | | | 1.29 | | | | N/A | | | | N/A | | Expected volatility | | | 43.0 | % | | | N/A | | | | N/A | | Expected forfeiture | | | 30.0 | % | | | N/A | | | | N/A | | Risk-free interest rate | | | 1.02 | % | | | N/A | | | | N/A | | Expected stock option life in years | | | 4.9 | | | | N/A | | | | N/A | | | | | | | | | | | | | | | Weighted-average stock option fair value per award granted | | $ | 0.30 | | | $ | N/A | | | $ | N/A | |
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