Note 8 - Stock-based Compensation - Summary of Unearned Restricted Stock Units (Details) - Restricted Stock Units (RSUs) [Member]	9 Months Ended
	Sep. 30, 2022 $ / shares shares
Nonvested, shares (in shares) | shares	136,948
Nonvested, weighted average grant date fair value (in dollars per share) | $ / shares	$ 16.52
Awarded, units (in shares) | shares	52,312
Awarded, weighted average grant date fair value (in dollars per share) | $ / shares	$ 32.80
Vested shares, units (in shares) | shares	(69,225)
Vested shares, weighted average grant date fair value (in dollars per share) | $ / shares	$ 16.13
Nonvested, shares (in shares) | shares	120,035
Nonvested, weighted average grant date fair value (in dollars per share) | $ / shares	$ 23.84