Note 5 - Share-based Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2022

Notes Tables

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

				Weighted		Weighted
				Average		Remaining		Aggregate
				Exercise		Contractual		Intrinsic
	Shares			Price		Life (years)		Value
Outstanding at beginning of year		839,400		$	2.20
Granted		248,000		$	3.11
Exercised		(109,700	)	$	1.78
Forfeited		(15,400	)	$	2.88
Expired		(900	)	$	1.68
Outstanding at end of year		961,400		$	2.47		6.14	$	2,375,619
Options exercisable at year-end		498,300		$	2.08		4.18	$	1,064,670

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

	2022				2021
Risk-free interest rate		1.55%	-	2.84%		.50%	-	1.34%
Expected life in years		6	-	7		6	-	7
Expected volatility			54%				54%
Expected dividend yield			0				0
Weighted average fair value of grants	$		3.11		$		1.72