Note 10 - Stock-based Compensation - Non-vested Restricted Stock Awards (Details) - Restricted Stock [Member]	12 Months Ended
	Dec. 31, 2021 $ / shares shares
Non-vested, shares (in shares) | shares	292,892
Non-vested, weighted-average grant date fair value (in dollars per share) | $ / shares	$ 13.96
Granted, shares (in shares) | shares	102,033
Granted, weighted-average grant date fair value (in dollars per share) | $ / shares	$ 18.49
Vested, shares (in shares) | shares	(101,751)
Vested, weighted-average grant date fair value (in dollars per share) | $ / shares	$ 13.63
Canceled, shares (in shares) | shares	(19,548)	[1]
Canceled, weighted-average grant date fair value (in dollars per share) | $ / shares	$ 13.63	[1]
Forfeited, shares (in shares) | shares	(37,194)
Forfeited, weighted-average grant date fair value (in dollars per share) | $ / shares	$ 13.30
Non-vested, shares (in shares) | shares	236,432
Non-vested, weighted-average grant date fair value (in dollars per share) | $ / shares	$ 16.19

[1] A surrender of vested stock awards by a participant surrendering the number of shares valued at the current stock price at the vesting date to cover the participant's tax obligation of the vested shares. The surrendered shares are canceled and are unavailable for reissue.