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Note 16 - Stock Option and Purchase Plans (Tables)

12 Months Ended

Dec. 31, 2022

Notes Tables

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

		Year ended December 31,
		2022				2021
Expected life (years)			4.3				4.1
Expected volatility			86.5	%			83.0	%
Risk-free interest rates			1.69	%			0.79	%
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, 2021			0			$	0
Granted			197,500				3.16
Vested			0				0
Forfeited			0				0
Nonvested shares at December 31, 2021			197,500				3.16
Granted			197,500				2.59
Vested			0				0
Forfeited			0				0
Nonvested shares at December 31, 2022			395,000			$	2.88				1.9			$	809,000

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, 2021			2,746,250			$	1.10
Granted			38,000				3.24
Exercised			(687,500	)			1.21
Forfeited			(107,000	)			0.93
Expired			(12,500	)			0.96
Outstanding at December 31, 2021			1,977,250				1.11
Granted			260,000				2.60
Exercised			(138,900	)			1.11
Forfeited			(51,000	)			0.86
Expired			(15,500	)			1.15
Outstanding at December 31, 2022			2,031,850			$	1.31				2.02			$	1,690,000
Exercisable at December 31, 2022			907,250			$	1.30				0.84			$	676,000

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.

+ References

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-Publisher FASB
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-Section 50
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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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