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Note 16 - Stock Option and Purchase Plans (Tables)

12 Months Ended

Dec. 31, 2024

Notes Tables

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

		Year ended December 31,
		2024				2023
Expected life (years)			4.0				4.3
Expected volatility			81.7	%			85.1	%
Risk-free interest rates			4.76	%			4.23	%
Expected dividend yield			0	%			0	%

Share-Based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block]

		Number of Shares				Weighted Average Grant Date Fair Value Per Share				Weighted Average Remaining Term				Aggregate Intrinsic Value
Nonvested shares at January 1, 2023			395,000			$	2.88
Granted			160,000				1.97
Vested			0				0
Forfeited			(42,500	)			2.29
Nonvested shares at December 31, 2023			512,500				2.64
Granted			617,500				1.66
Vested			(165,000	)			3.03
Forfeited			(82,000	)			2.71
Nonvested shares at December 31, 2024			883,000			$	1.87				1.8			$	1,571,740

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

		Number of Shares				Weighted Average Exercise Price Per Share				Weighted Average Remaining Term				Aggregate Intrinsic Value
Outstanding at January 1, 2023			2,031,850			$	1.31
Granted			372,750				1.97
Exercised			(525,600	)			1.41
Forfeited			(32,250	)			1.31
Expired			(22,500	)			1.50
Outstanding at December 31, 2023			1,824,250				1.41
Granted			394,000				1.64
Exercised			(226,500	)			0.90
Forfeited			0				0
Expired			(402,500	)			1.06
Outstanding at December 31, 2024			1,589,250			$	1.63				2.52			$	570,520
Exercisable at December 31, 2024			563,700			$	0.95				0.52			$	511,200

X

- Definition

Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year.

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- Definition

Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

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