Note 10 - Share-based Compensation - Restricted Stock Units Activity (Details) - The 2014 Plan [Member]	9 Months Ended
	Oct. 01, 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	56,500
Granted, weighted average grant date fair value (in dollars per share) | $ / shares	$ 8.07
Vested (in shares) | shares	(108,175)
Vested, weighted average grant date fair value (in dollars per share) | $ / shares	$ 2.72
Forfeited or expired (in shares) | shares	(65,258)
Forfeited or expired, weighted average grant date fair value (in dollars per share) | $ / shares	$ 1.95
Outstanding non-vested (in shares) | shares	303,695
Outstanding non-vested, weighted average grant date fair value (in dollars per share) | $ / shares	$ 3.87
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