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Note 11 - Share-based Compensation - Restricted Stock Units Activity (Details) - The 2014 Plan [Member]
6 Months Ended
Jul. 03, 2021
$ / shares
shares
Time-based Restricted Stock Units [Member]  
Outstanding non-vested (in shares) | shares 709,805
Outstanding non-vested, weighted average grant date fair value (in dollars per share) | $ / shares $ 1.92
Granted (in shares) | shares 96,749
Granted, weighted average grant date fair value (in dollars per share) | $ / shares $ 2.80
Vested (in shares) | shares (182,508)
Vested, weighted average grant date fair value (in dollars per share) | $ / shares $ 1.98
Forfeited or expired (in shares) | shares 0
Forfeited or expired, weighted average grant date fair value (in dollars per share) | $ / shares $ 0
Outstanding non-vested (in shares) | shares 624,046
Outstanding non-vested, weighted average grant date fair value (in dollars per share) | $ / shares $ 2.04
Performance-based Restricted Stock Units [Member]  
Outstanding non-vested (in shares) | shares 0
Outstanding non-vested, weighted average grant date fair value (in dollars per share) | $ / shares $ 0
Granted (in shares) | shares 90,000
Granted, weighted average grant date fair value (in dollars per share) | $ / shares $ 3.26
Vested (in shares) | shares 0
Vested, weighted average grant date fair value (in dollars per share) | $ / shares $ 0
Forfeited or expired (in shares) | shares 0
Forfeited or expired, weighted average grant date fair value (in dollars per share) | $ / shares $ 0
Outstanding non-vested (in shares) | shares 90,000
Outstanding non-vested, weighted average grant date fair value (in dollars per share) | $ / shares $ 3.26