Note 10 - Share-based Compensation - Restricted Stock Units Activity (Details) - The 2014 Plan [Member]	3 Months Ended
	Apr. 02, 2022 $ / shares shares
Time-based Restricted Stock Units [Member]
Outstanding non-vested (in shares) | shares	420,628
Outstanding non-vested, weighted average grant date fair value (in dollars per share) | $ / shares	$ 2.69
Granted (in shares) | shares	50,000
Granted, weighted average grant date fair value (in dollars per share) | $ / shares	$ 6.71
Vested (in shares) | shares	(80,675)
Vested, weighted average grant date fair value (in dollars per share) | $ / shares	$ 2.99
Forfeited or expired (in shares) | shares	(20,000)
Forfeited or expired, weighted average grant date fair value (in dollars per share) | $ / shares	$ 1.55
Outstanding non-vested (in shares) | shares	369,953
Outstanding non-vested, weighted average grant date fair value (in dollars per share) | $ / shares	$ 3.24
Performance-based Restricted Stock Units [Member]
Outstanding non-vested (in shares) | shares	125,000
Outstanding non-vested, weighted average grant date fair value (in dollars per share) | $ / shares	$ 3.26
Granted (in shares) | shares	100,000
Granted, weighted average grant date fair value (in dollars per share) | $ / shares	$ 6.15
Vested (in shares) | shares	(125,000)
Vested, weighted average grant date fair value (in dollars per share) | $ / shares	$ 3.26
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	100,000
Outstanding non-vested, weighted average grant date fair value (in dollars per share) | $ / shares	$ 6.15