Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($)	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Total
Balances at Dec. 31, 2019	$ 128,543	$ 14,682,937	$ (12,718,893)	$ (930,211)	$ 1,162,376
Net income (loss)	0	0	(126,339)	0	(126,339)
Stock option compensation	0	450	0	0	450
Balances at Mar. 31, 2020	128,543	14,683,387	(12,845,232)	(930,211)	1,036,487
Balances at Dec. 31, 2019	128,543	14,682,937	(12,718,893)	(930,211)	1,162,376
Net income (loss)					(160,959)
Balances at Jun. 30, 2020	128,543	14,683,743	(12,879,852)	(930,211)	1,002,223
Balances at Mar. 31, 2020	128,543	14,683,387	(12,845,232)	(930,211)	1,036,487
Net income (loss)	0	0	(34,620)	0	(34,620)
Stock option compensation	0	356	0	0	356
Balances at Jun. 30, 2020	128,543	14,683,743	(12,879,852)	(930,211)	1,002,223
Balances at Dec. 31, 2020	129,043	14,720,065	(12,305,514)	(930,211)	1,613,383
Net income (loss)	0	0	270,815	0	270,815
Stock option compensation	0	27,711	0	0	27,711
Stock issued	3,306	492,693	0	0	495,999
Issuance of stock from exercise of options	250	3,300	0	0	3,550
Balances at Mar. 31, 2021	132,599	15,243,769	(12,034,699)	(930,211)	2,411,458
Balances at Dec. 31, 2020	129,043	14,720,065	(12,305,514)	(930,211)	1,613,383
Net income (loss)					313,972
Balances at Jun. 30, 2021	136,882	15,629,898	(11,991,542)	(930,211)	2,845,027
Balances at Mar. 31, 2021	132,599	15,243,769	(12,034,699)	(930,211)	2,411,458
Net income (loss)	0	0	43,157	0	43,157
Stock option compensation	0	111,862	0	0	111,862
Stock issued	683	197,872	0	0	198,555
Issuance of stock from exercise of options	3,600	76,395	0	0	79,995
Balances at Jun. 30, 2021	$ 136,882	$ 15,629,898	$ (11,991,542)	$ (930,211)	$ 2,845,027