Note 6 - Shareholders' Equity (Tables)

12 Months Ended

Dec. 31, 2021

Notes Tables

Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block]

	Year ended December 31,
	2021		2020
Stock options	$	618	$	838
Restricted stock		53		105
Total	$	671	$	943

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

	Year ended December 31,
	2021			2020
Risk-free interest rate		1.0	%		0.4	%
Volatility factor		50	%		49	%
Weighted average expected life (years)		4.8			5.3
Forfeiture rate		10.0	%		10.0	%
Dividends		0.0	%		0.0	%

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

Year ended December 31, 2021
	Number of shares			Weighted average exercise price per share		Weighted average remaining contractual term		Aggregate intrinsic value
Shares under option – January 1		1,217,163		$	6.50
Options granted		340,500			6.78
Options exercised		(204,429	)		4.39
Options forfeited or expired		(46,410	)		7.44
Shares under option – December 31		1,306,824		$	6.87		4.22	$	504
Vested and expected to vest - December 31		1,189,175		$	6.86		4.05	$	492
Options exercisable – December 31		745,288		$	6.85		2.80	$	439

Year ended December 31, 2020
	Number of shares			Weighted average exercise price per share
Shares under option – January 1		1,541,792		$	6.88
Options granted		256,000			6.51
Options exercised		(355,797	)		6.08
Options forfeited or expired		(224,832	)		9.76
Shares under option – December 31		1,217,163		$	6.50
Options exercisable – December 31		738,452		$	5.82

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

			Option outstanding						Options exercisable
Range of exercise prices			Number of outstanding options		Weighted- average remaining contractual life		Weighted- average exercise price		Number of options exercisable		Weighted- average exercise price
$3.71	-	$5.31		325,579		2.68	$	4.58		240,579	$	4.34
$5.71	-	$6.51		321,411		4.36		6.28		166,602		6.07
$6.69	-	$7.16		205,750		6.45		6.97		11,667		7.09
$8.25	-	$9.96		454,084		4.22		8.88		326,440		9.08
$3.71	-	$9.96		1,306,824		4.22	$	6.87		745,288	$	6.85