Note 8 - Stock-based Compensation (Tables)

6 Months Ended

Jun. 30, 2021

Notes Tables

Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2021		2020		2021		2020
Stock options and restricted stock units, net of forfeited	$	20	$	69	$	40	$	150
After-tax effect of stock-based compensation	$	20	$	69	$	40	$	150

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

						Weighted- Average
	Number			Weighted-		Remaining		Aggregate
	of			Average		Contractual		Intrinsic
	Options			Exercise Price		Term		Value
Outstanding on January 1, 2021		484,500		$	3.57
Granted		—			—
Exercised		—			—
Expired or forfeited		(50,000	)		8.16
Outstanding on June 30, 2021		434,500		$	3.05		3.59	$	142,670
Exercisable on June 30, 2021		434,500		$	3.05		3.59	$	142,670

Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]

				Weighted Average
				Grant Date
	Shares			Fair Value
Unvested restricted stock units at January 1, 2021		100,005		$	4.08
Granted		—			—
Forfeited		(5,000	)		0.97
Vested		(50,002	)		1.50
Unvested restricted stock units at June 30, 2021		45,003		$	7.29