Consolidated Statements of Stockholders' Equity - USD ($)	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Total
Balance at Dec. 31, 2018	$ 690,200	$ 51,382,585	$ (36,971,124)	$ 65,829,687	$ (452,756)	$ 80,478,592
NET INCOME	0	0	0	9,415,090	0	9,415,090
Other comprehensive income (loss)	0	0	0	0	21,721	21,721
Dividends on common stock	0	0	0	(2,384,027)	0	(2,384,027)
Treasury stock purchased	0	0	(3,604,879)	0	0	(3,604,879)
Stock award plans	0	438,032	177,353	0	0	615,385
Stock options exercised	1,750	88,250	0	0	0	90,000
Balance at Dec. 31, 2019	691,950	51,908,867	(40,398,650)	72,860,750	(431,035)	84,631,882
NET INCOME	0	0	0	6,832,214	0	6,832,214
Other comprehensive income (loss)	0	0	0	0	377,657	377,657
Dividends on common stock	0	0	0	(2,619,257)	0	(2,619,257)
Treasury stock purchased	0	0	(390,268)	0	0	(390,268)
Stock award plans	0	(571,648)	707,786	0	0	136,138
Balance at Dec. 31, 2020	691,950	51,337,219	(40,081,132)	77,073,707	(53,378)	88,968,366
NET INCOME	0	0	0	10,638,142	0	10,638,142
Other comprehensive income (loss)	0	0	0	0	2,951	2,951
Dividends on common stock	0	0	0	(2,630,650)	0	(2,630,650)
Stock award plans	0	198,986	286,336	0	0	485,322
Balance at Dec. 31, 2021	$ 691,950	$ 51,536,205	$ (39,794,796)	$ 85,081,199	$ (50,427)	$ 97,464,131