Note 9 - Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2021

Notes Tables

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

	Years Ended December 31,
	2021		2020
	(in thousands)
Share-based compensation expense:
Cost of revenues	$	—	$	—
Sales and marketing		149		116
Technology support		33		81
General and administrative		1,672		1,787
Share-based compensation expense		1,854		1,984
Amount capitalized to internal use software		—		—
Total share-based compensation expense	$	1,854	$	1,984

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

	Years Ended December 31,
	2021			2020
Expected volatility		95	%		74	%
Expected risk-free interest rate		0.8	%		0.9	%
Expected life (years)		4.8			4.6

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

	Number of Options			Weighted Average Exercise Price per Share		Weighted Average Remaining Contractual Term		Aggregate Intrinsic Value
						(years)		(thousands)
Outstanding at December 31, 2020		3,758,670		$	4.26		4.7	$	270
Granted		957,000			2.65
Exercised		(100,278	)		2.27				75
Forfeited or expired		(234,044	)		6.14
Outstanding at December 31, 2021		4,381,348			3.85		4.3		1,662
Vested and expected to vest at December 31, 2021		4,269,151		$	3.88		4.2	$	1,586
Exercisable at December 31, 2021		2,889,095		$	4.42		3.6	$	701

Schedule of Warrants or Rights and Share-based Compensation Arrangement [Table Text Block]

	Number of Shares
Stock options outstanding		4,381,348
Authorized for future Award grants under stockholder-approved stock-based incentive plans		1,553,142
Warrants outstanding		1,482,400
Total		7,416,890