Note 10 - Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2021

Notes Tables

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

2001 Non-Qualified Stock Option Plan
	Beginning Balance Outstanding		Granted During Period		Exercised During Period		Canceled During Period			Ending Balance Outstanding		Exercisable
Year ended December 31, 2020
Number of shares		22,930		-		-		(15,930	)		7,000		7,000
Weighted average exercise price per share	$	5.36		-		-	$	4.25		$	7.90	$	7.90
Year ended December 31, 2021
Number of shares		7,000		-		-		(7,000	)		-		-
Weighted average exercise price per share	$	7.90		-		-	$	7.90			-		-

2007 Share Incentive Plan
		Beginning Balance Outstanding	Granted During Period	Exercised During Period		Canceled During Period			Ending Balance Outstanding		Exercisable
Number of shares		345,000	-	-		-			345,000		305,000
Weighted average exercise price per share	$	12.33	-	-		-		$	12.33	$	12.60
Year ended December 31, 2021
Number of shares		345,000	-	-		(125,000	)		220,000		200,000
Weighted average exercise price per share	$	12.33	-	-	$	11.94		$	12.56	$	12.78

2007 Share Incentive Plan
		Beginning Balance Outstanding		Granted During Period	Exercised During Period	Canceled During Period		Ending Balance Outstanding		Exercisable
Year ended December 31, 2020
Number of shares		65,000		-	-	-		65,000		-
Weighted average exercise price per share	$	5.94		-	-	-	$	5.94		-
Year ended December 31, 2021
Number of shares		65,000		333,500	-	-		398,500		65,000
Weighted average exercise price per share	$	5.94	$	4.13	-	-	$	4.43	$	5.94

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

Stock Price	$	4.13
Exercise Price	$	4.13
Dividend yield		0	%
Expected volatility		67	%
Risk-Free interest rate		1.36	%
Expected life (in years)		6.00

Share-based Payment Arrangement, Option, Exercise Price Range [Table Text Block]

		Options Outstanding									Options Exercisable
Exercise Price Range		Number Outstanding		Weighted Average Remaining Contractual		Weighted Average Exercise Price		Intrinsic Value		Number Exercisable		Weighted Average Exercise Price		Intrinsic Value
$	4.00-7.00		378,500		9.3	$	4.23	$	21,000		45,000	$	5.00	$	0
$	7.01-10.00		20,000		6.3	$	8.07	$	0		20,000	$	8.07	$	0
$	10.01-12.00		120,000		3.6	$	10.52	$	0		100,000	$	10.56	$	0
$	12.01-15.00		100,000		.6	$	15.00	$	0		100,000	$	15.00	$	0

Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block]

	Shares of Restricted Stock			Weighted Average Grant Date Fair Value
Unvested outstanding at January 1, 2020		0		$	0
Granted		30,200		$	3.74
Vested		(30,200	)	$	3.74
Forfeited/Cancelled		-			-
Unvested outstanding at December 31, 2020		0		$	0
Granted		42,800		$	4.65
Vested		(36,000	)	$	4.60
Forfeited/Cancelled		(6,800	)	$	4.90
Unvested outstanding at December 31, 2021		0		$	0

	Shares of Restricted Stock Units			Weighted Average Grant Date Fair Value
Unvested outstanding at January 1, 2020		22,575		$	4.66
Granted		-			-
Vested		(12,825	)	$	8.81
Forfeited/Cancelled		(1,000	)	$	5.45
Unvested outstanding at December 31, 2020		8,750		$	5.00
Granted		-			-
Vested		(3,250	)	$	5.29
Forfeited/Cancelled		(-	)	$	- -
Unvested outstanding at December 31, 2021		5,500		$	4.82