4. Accounting for Stock-based Compensation (Details Narrative) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Stock-based compensation expense			$ 174,000	$ 24,000
Options [Member]
Options granted, shares	10,000	10,000	24,000	333,000
Stock-based compensation expense	$ 10,000	$ 10,000	$ 24,000	$ 174,000
Stock options exercised, shares	133,000	10,500	319,600	291,000
Options [Member] | 2015 Plan [Member]
Stock options exercised, shares	30,000		45,000
Options [Member] | 2005 Plan [Member]
Stock options exercised, shares	103,000	10,500	274,600	291,000