Quarterly report pursuant to Section 13 or 15(d)

Note 6 - Capital Stock - Stock Option Activity (Details)

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Note 6 - Capital Stock - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jul. 01, 2018
Jul. 01, 2018
Dec. 31, 2017
Balance, options outstanding (in shares)   1,870,753  
Balance, outstanding weighted average exercise price (in dollars per share)   $ 1.39  
Balance, aggregate intrinsic value $ 585 $ 585 $ 61
Balance, outstanding weighted average remaining contractual term (Year)   8 years 292 days 8 years 219 days
Options granted, number of options (in shares) 335,929 335,929  
Options granted, weighted average exercise price (in dollars per share)   $ 2.07  
Exercised (in shares)   (211,135)  
Exercised (in dollars per share)   $ 1.71  
Forfeited (in shares)   (316,180)  
Forfeited (in dollars per share)   $ 1.25  
Balance, options outstanding (in shares) 1,679,367 1,679,367 1,870,753
Balance, outstanding weighted average exercise price (in dollars per share) $ 1.52 $ 1.52 $ 1.39
Exercisable, number of options (in shares) 480,741 480,741  
Exercisable, weighted average exercise price (in dollars per share) $ 1.60 $ 1.60  
Exercisable, aggregate intrinsic value $ 556 $ 556  
Exercisable weighted average remaining contractual term (Year)   8 years 36 days