Note 13 - Stock-based Compensation (Tables)

12 Months Ended

Dec. 31, 2023

Notes Tables

Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

	2023			2022
Risk-free interest rate		4.6	%		1.9% - 4.3%
Dividend yield		0	%		0	%
Expected term (years)		3.25 - 3.50			3.25 - 6.00
Expected volatility		33.5% - 36.7%			45.8% - 48.1%

Share-Based Payment Arrangement, Option, Activity [Table Text Block]

	Shares			Weighted average exercise price per share		Weighted Average Remaining Contractual Term	Aggregate Intrinsic Value
Outstanding at December 31, 2021		290,450		$	31.70	4 years, 11 months	$	5,195,253
Options granted		195,200			28.15
Options exercised		(26,400	)		2.80
Options expired		(500	)		3.50
Options forfeited		(3,500	)		13.00
Outstanding at December 31, 2022		455,250		$	32.05	6 years, 5 months	$	95,937
Options granted		85,000			2.11
Options exercised		(2,000	)		3.70
Options expired		(59,750	)		23.53
Options forfeited		(87,500	)		30.11
Outstanding at December 31, 2023		391,000		$	27.43	5 years, 4 months	$	998
Exercisable at December 31, 2023		224,570		$	36.61	4 years, 6 months	$	998

Schedule of Nonvested Share Activity [Table Text Block]

	Nonvested
	Shares			Weighted average exercise price per share		Weighted average grant date fair value
Nonvested at December 31, 2021		95,250		$	40.70	$	15.10
Granted		195,200			28.15		13.65
Vested		(51,375	)		39.00		14.70
Forfeited		(3,500	)		13.00		13.00
Nonvested at December 31, 2022		235,575		$	31.10	$	14.00
Granted		85,000			2.11		0.65
Vested		(58,145	)		33.47		13.82
Expired		(8,500	)		49.82		21.45
Forfeited		(87,500	)		30.11		12.68
Nonvested at December 31, 2023		166,430		$	15.04	$	6.60