Note 13 - Stock-based Compensation (Tables)

3 Months Ended

Mar. 31, 2025

Notes Tables

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

	Non-Employee Director Options Issued January 29, 2025			CEO Options Issued January 29, 2025			Employee Options (4 years) Issued January 29, 2025			Employee Options (5 years) Issued January 29, 2025
Risk-free interest rate		4.55	%		4.55	%		4.55	%		4.55	%
Volatility		98.00	%		97.50	%		97.40	%		98.20	%
Expected dividend yield		0.00	%		0.00	%		0.00	%		0.00	%
Expected life (in years)		5.5			5.8			6.0			6.5

	Employee Options with Quarterly Sales Targets Issued January 29, 2025			Employee Options with Tiered Sales Targets Issued January 29, 2025
Risk-free interest rate		4.55	%		4.55	%
Volatility		98.40	%		98.00	%
Expected dividend yield		0.00	%		0.00	%
Expected life (in years)		5.3			5.5

	Non-Plan Options Issued January 6, 2025
Risk-free interest rate		4.62	%
Volatility		97.00	%
Expected dividend yield		0.00	%
Expected life (in years)		5.8

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

				Weighted		Weighted
				Average		Average		Aggregate
				Exercise		Remaining		Intrinsic
	Stock Options			Price		Life		Value (in thousands)
Outstanding at December 31, 2024		70,605		$	20.88		8.38	$	—
Options exercised		—			—		—		—
Options granted		1,627,500			0.42		—		—
Cancelled/forfeited		(56,921	)		0.65		—		—
Outstanding at March 31, 2025		1,641,184		$	1.29		9.76	$	—
Vested and expected to vest at March 31, 2025		1,641,184		$	1.29		9.76	$	—
Exercisable at March 31, 2025		278,288		$	4.95		9.56	$	—

			Weighted		Weighted
			Average		Average		Aggregate
			Exercise		Remaining		Intrinsic
	Stock Options		Price		Life		Value (in thousands)
Outstanding at December 31, 2024		25,000	$	5.32		9.33	$	—
Options exercised		—		—		—		—
Options granted		500,000		0.53		—		—
Cancelled/forfeited		—		—		—		—
Outstanding at March 31, 2025		525,000	$	0.76		9.74	$	—
Vested and expected to vest at March 31, 2025		525,000	$	0.76		9.74	$	—
Exercisable at March 31, 2025		27,778	$	0.53		9.77	$	—

Nonvested Restricted Stock Shares Activity [Table Text Block]

				Weighted
				Average
				Grant Date
	Restricted Stock Awards			Fair Value
Outstanding at December 31, 2024		—		$	—
Granted		100,000			0.47
Vested		(49,999	)		0.47
Forfeited		—			—
Outstanding at March 31, 2025		50,001		$	0.47

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

	Unrecognized Expense (in thousands)		Remaining Weighted Average Recognition Period
Stock options (Non-Plan Options)	$	299		3.2
Stock options (2023 Plan Options)	$	589		3.2
Restricted stock awards	$	20		0.2