Note 16 - Stock-Based Compensation - Options Outstanding (Details)	12 Months Ended
	Dec. 31, 2021 $ / shares shares
Number outstanding (in shares) | shares	367,998
Number exercisable (in shares) | shares	318,266
$9.30
Exercise price range	$ 9.30
Number outstanding (in shares) | shares	29,406
Weighted average remaining contractual life (Year)	29 days
Weighted average exercise price options outstanding (in dollars per share)	$ 9.30
Number exercisable (in shares) | shares	29,406
Weighted average exercise price options exercisable (in dollars per share)	$ 9.30
$15.50 to $15.65
Exercise price range, lower range (in dollars per share)	15.50
Exercise price range, upper range (in dollars per share)	$ 15.65
Number outstanding (in shares) | shares	64,106
Weighted average remaining contractual life (Year)	1 year 3 months
Weighted average exercise price options outstanding (in dollars per share)	$ 15.64
Number exercisable (in shares) | shares	64,066
Weighted average exercise price options exercisable (in dollars per share)	$ 15.64
$17.10 to $18.00
Exercise price range, lower range (in dollars per share)	17.10
Exercise price range, upper range (in dollars per share)	$ 18.00
Number outstanding (in shares) | shares	110,499
Weighted average remaining contractual life (Year)	2 years 6 months 25 days
Weighted average exercise price options outstanding (in dollars per share)	$ 17.31
Number exercisable (in shares) | shares	110,459
Weighted average exercise price options exercisable (in dollars per share)	$ 17.31
$22.64 to $29.77
Exercise price range, lower range (in dollars per share)	22.64
Exercise price range, upper range (in dollars per share)	$ 29.77
Number outstanding (in shares) | shares	55,216
Weighted average remaining contractual life (Year)	4 years 2 months 12 days
Weighted average exercise price options outstanding (in dollars per share)	$ 22.83
Number exercisable (in shares) | shares	53,716
Weighted average exercise price options exercisable (in dollars per share)	$ 22.64
$36.00 to $41.95
Exercise price range, lower range (in dollars per share)	36.00
Exercise price range, upper range (in dollars per share)	$ 41.95
Number outstanding (in shares) | shares	37,834
Weighted average remaining contractual life (Year)	7 years 7 months 28 days
Weighted average exercise price options outstanding (in dollars per share)	$ 38.25
Number exercisable (in shares) | shares	14,360
Weighted average exercise price options exercisable (in dollars per share)	$ 37.84
$42.65 to $48.50
Exercise price range, lower range (in dollars per share)	42.65
Exercise price range, upper range (in dollars per share)	$ 48.50
Number outstanding (in shares) | shares	70,937
Weighted average remaining contractual life (Year)	6 years 7 months 2 days
Weighted average exercise price options outstanding (in dollars per share)	$ 43.78
Number exercisable (in shares) | shares	46,259
Weighted average exercise price options exercisable (in dollars per share)	$ 43.84