Note 11 - Stock Option Plan (Tables)

12 Months Ended

Dec. 31, 2019

Table Text Block Supplement [Abstract]

Schedule of Stock Option Plan Activity

A summary of activity follows (shares in thousands):

	2019		2018
		Weighted-		Weighted-
		Average		Average
	Number	Exercise	Number	Exercise
	of Shares	Price	of Shares	Price
Outstanding as of beginning of the year	1,597	$ 0.65	1,610	$ 0.66
Granted	166	0.80	150	1.12
Exercised	(130)	0.17	-	-
Forfeited or expired	(41)	0.66	(163)	1.21
Outstanding as of end of the year	1,592	0.71	1,597	0.65
Exercisable as of end of the year	1,523	0.61	1,131	0.48

Schedule of Stock Options Valuation Assumptions

The fair value of each option grant is estimated on the date of the grant using the Black-Scholes option-pricing model with the following weighted-average assumptions used for the grants made in 2019 and 2018:

	2019	2018
Expected life (in years)	3.5	3.5
Risk free interest rate	2.6%	2.0%
Expected volatility	81.2%	125.0%
Dividend yield	-	-