Note 7 - Stock-based Compensation (Tables)

3 Months Ended

Mar. 31, 2024

Notes Tables

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

	Options Outstanding
	Number of Options (*)			Weighted- Average Exercise Price (*)		Weighted- Average Remaining Contractual Life (years)		Aggregate Intrinsic Value
Balance—January 1, 2024		16,365		$	110.51		5.00	$	—
Options granted		—		$	—		—	$	—
Options exercised		—		$	—		—	$	—
Options canceled		(426	)	$	93.71		—	$	—
Balance—March 31, 2024		15,939		$	110.96		4.57	$	—
Exercisable as of March 31, 2024		15,939		$	110.96		4.57	$	—
Vested and expected to vest as of March 31, 2024		15,939		$	110.96		4.57	$	—

Nonvested Restricted Stock Shares Activity [Table Text Block]

Restricted Stock Awards	Shares (*)			Weighted Average Grant-Date Fair Value (*)
Nonvested at January 1, 2024		840,815		$	9.73
Granted		11,668		$	3.97
Vested		(51,168	)	$	25.58
Forfeited		(42,650	)	$	11.24
Nonvested at March 31, 2024		758,665		$	8.49

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

	Three Months Ended March 31,
	2023		2024
	(in thousands)
Sales and distribution expenses	$	671	$	299
Research and development expenses		434		—
General and administrative expenses		1,212		1,368
Total stock-based compensation expense	$	2,317	$	1,667