Note 11 - Stock-based Compensation (Tables)

12 Months Ended

Dec. 31, 2021

Notes Tables

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

	Stock Options			Weighted Average Exercise Price		Weighted Average Remaining Contractual Life (in years)		Aggregate Intrinsic Value
Outstanding at January 1, 2020		8,013		$	0.54		8.5	$	-
Options granted		50			0.44		10.0		-
Options forfeited/expired		(560	)		0.63		-		-
Outstanding at December 31, 2020		7,503			0.54		8.5	$	-
Options granted		80			0.44		10.0		-
Options forfeited/expired		(460	)		0.44		-		-
Outstanding at December 31, 2021		7,123		$	0.54		7.5	$	-
Options vested and exercisable at December 31, 2021		5,376		$	0.57		7.3	$	-

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

	For the years ended
	December 31,
	2021			2020
Exercise price	$	0.4431		$	0.4431
Contractual term (years)		6.00			6.00
Volatility (annual)		85.0	%		75.0	%
Risk-free rate		0.9	%		0.5	%
Dividend yield (per share)		0	%		0	%