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Note 17 - Stock Option and Purchase Plans (Tables)

12 Months Ended

Dec. 31, 2020

Notes Tables

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

		Year ended December 31,
		2020				2019
Expected life (years)			4				4.0
Expected volatility			52.6	%			53.9	%
Risk-free interest rates			0.34	%			2.30	%
Expected dividend yield			0.0	%			0.0	%

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

						Weighted-				Weighted-
						average				average				Aggregate
		Number of				Grant Date				Remaining				Intrinsic
		Shares				Fair Value				Term				Value
Nonvested shares at January 1, 2020			324,500			$	1.03
Granted			0				0
Vested			(324,500	)			1.03
Forfeited			0				0
Nonvested shares at December 31, 2020			0			$	0				0			$	0

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

						Weighted-				Weighted-
						average				average				Aggregate
		Number of				Exercise Price				Remaining				Intrinsic
		Shares				Per Share				Term				Value
Outstanding at January 1, 2020			2,567,750			$	1.26
Granted			930,000				0.82
Exercised			(306,500	)			0.96
Forfeited			0				0
Expired			(445,000	)			1.5
Outstanding at December 31, 2020			2,746,250			$	1.10				2.97				1,211,995
Exercisable at December 31, 2020			517,000			$	1.04				0.74				250,500

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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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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