3. Accounting for Stock-based Compensation (Details Narrative) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Stock-based compensation expense	$ 204,000	$ 19,000
Options [Member]
Options granted, shares	65,000	0
Stock-based compensation expense	$ 204,000	$ 19,000
Options [Member] | 2005 Plan [Member]
Stock options exercised, shares	197,227	157,600
Options [Member] | 2015 Plan [Member]
Stock options exercised, shares	0	15,000