3. Earnings (Loss) per Share (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Net income	$ 83,498	$ 467,607	$ 524,198	$ 1,385,003
Net income per share with assumed conversions	$ 99,123	$ 515,107	$ 609,677	$ 1,530,000
Weighted average number of common shares outstanding, basic	22,215,512	21,976,283	22,215,512	21,797,946
Weighted average number of common shares outstanding, diluted	23,765,512	23,547,037	23,765,512	23,368,701
Earnings per share, basic	$ 0.00	$ 0.02	$ 0.02	$ 0.06
Earnings per share, diluted	$ 0.00	$ 0.02	$ 0.03	$ 0.06
Options and Warrants
Effect of dilutive securities		20,775		20,755
Convertible Notes
Effect of dilutive securities	$ 15,625	$ 47,500	$ 85,479	$ 145,000
Effect of dilutive securities	1,550,000	1,550,000	1,550,000	1,550,000