Note 11 - Share Based Compensation - Restricted Stock Units Activity (Details) - The 2014 Plan [Member]	3 Months Ended
	Apr. 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	(107,696)
Vested, weighted average grant date fair value (in dollars per share) | $ / shares	$ 2.21
Forfeited or expired (in shares) | shares
Forfeited or expired, weighted average grant date fair value (in dollars per share) | $ / shares
Outstanding non-vested (in shares) | shares	698,858
Outstanding non-vested, weighted average grant date fair value (in dollars per share) | $ / shares	$ 2
Performance-based Restricted Stock Units [Member]
Outstanding non-vested (in shares) | shares
Outstanding non-vested, weighted average grant date fair value (in dollars per share) | $ / shares
Granted (in shares) | shares	90,000
Granted, weighted average grant date fair value (in dollars per share) | $ / shares	$ 3.26
Vested (in shares) | shares
Vested, weighted average grant date fair value (in dollars per share) | $ / shares
Forfeited or expired (in shares) | shares
Forfeited or expired, weighted average grant date fair value (in dollars per share) | $ / shares
Outstanding non-vested (in shares) | shares	90,000
Outstanding non-vested, weighted average grant date fair value (in dollars per share) | $ / shares	$ 3.26