Note 8 - Stock-based Compensation (Tables)
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12 Months Ended |
Dec. 30, 2018 |
Notes Tables |
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Share-based Compensation, Stock Options, Activity [Table Text Block] |
| | | | | | | | | | | | | 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 | | | | | | | | | | Options granted | | | 385,929 | | | | 2.16 | | | | | | | | | | Options forfeited | | | (316,180 | ) | | | 1.25 | | | | | | | | | | Options expired | | | — | | | | — | | | | | | | | | | Options exercised | | | (220,678 | ) | | | 1.71 | | | | | | | | | | | | | | | | | | | | | | | | | | | Outstanding balance at December 30, 2018 | | | 1,719,824 | | | $ | 1.55 | | | $ | 1,998 | | | | 8.6 | | | | | | | | | | | | | | | | | | | Exercisable balance at December 30, 2018 | | | 771,192 | | | $ | 1.55 | | | $ | 1,871 | | | | 8.0 | |
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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 | | | 0.0 | % | | | N/A | | | | 0.0 | % | Expected volatility | | | 42.1 | % | | | N/A | | | | 43.8 | % | Expected forfeiture | | | 30.0 | % | | | N/A | | | | 29.0 | % | Risk-free interest rate | | | 2.84 | % | | | N/A | | | | 1.33 | % | Expected stock option life in years | | | 4.0 | | | | N/A | | | | 4.0 | | | | | | | | | | | | | | | Weighted-average stock option fair value per stock option granted | | $ | 1.00 | | | $ | N/A | | | $ | 0.48 | |
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Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block] |
| | | Weighted average exercise price | | | | | | Weighted average exercise price | | 326,108 | | | $ | 1.80 | | | | 233,704 | | | $ | 1.80 | | 671,858 | | | | 1.23 | | | | 268,744 | | | | 1.23 | | 335,929 | | | | 1.26 | | | | 134,372 | | | | 1.26 | | 50,000 | | | | 2.74 | | | | — | | | | — | | 335,929 | | | | 2.07 | | | | 134,372 | | | | 2.07 | | 1,719,824 | | | | 1.55 | | | | 771,192 | | | | 1.55 | |
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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 | | | | N/A | | | $ | 1.34 | | Expected volatility | | | N/A | | | | N/A | | | | 42.2 | % | Expected forfeiture | | | N/A | | | | N/A | | | | 29.0 | % | Risk-free interest rate | | | N/A | | | | N/A | | | | 0.60 | % | RSU term in years | | | N/A | | | | N/A | | | | 3.0 | | | | | | | | | | | | | | | Weighted-average RSU fair value per award granted | | | N/A | | | | N/A | | | $ | 0.42 | |
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Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] |
| | | | | | | | | | | | | | | | | | | | | | | Outstanding balance at January 3, 2016 | | | 479,564 | | | $ | 1.88 | | | | | | 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 | | | | | | | | | | | | | | | RSU granted | | | 54,811 | | | | 3.09 | | | | | | RSU forfeited | | | (75,151 | ) | | | 0.91 | | | | | | RSU converted into common shares | | | (198,306 | ) | | | 1.82 | | | | | | | | | | | | | | | | | | | Outstanding balance at December 30, 2018 | | | 357,377 | | | $ | 0.96 | | | | 1.21 | |
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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 | | $ | 2.07 | | | $ | 1.29 | | | | N/A | | Expected volatility | | | 43.0 | % | | | 43.0 | % | | | N/A | | Expected forfeiture | | | 30.0 | % | | | 30.0 | % | | | N/A | | Risk-free interest rate | | | 1.02 | % | | | 1.02 | % | | | N/A | | Expected stock option life in years | | | 4.0 | | | | 4.9 | | | | N/A | | | | | | | | | | | | | | | Weighted-average stock option fair value per award granted | | $ | 0.47 | | | $ | 0.30 | | | $ | N/A | |
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