Consolidated Statements of Stockholders' Equity - USD ($)	Common Stock [Member]	Capital in Excess of Par Value [Member]	Accumulated Earnings [Member]	Other Comprehensive Income [Member]	Total	Non-Controlling Interests [Member]	Total Stockholders' Equity [Member]
Beginning balance at Dec. 31, 2018	$ 11,700	$ 15,328,285	$ 2,941,889	$ (1,222,573)	$ 17,059,301	$ 2,462,231	$ 19,521,532
Beginning balance, Shares at Dec. 31, 2018	11,699,657
Translation adjustment				227,963	227,963		227,963
Net income			1,912,392		1,912,392	384,793	2,297,185
Dividends paid			(2,398,133)		(2,398,133)		(2,398,133)
Distributions to noncontrolling interests						(296,875)	(296,875)
Stock-based compensation		246,444			246,444		246,444
Common stock issued	$ 516	862,744			863,260		863,260
Common stock issued, Shares	515,888
Ending balance at Dec. 31, 2019	$ 12,216	16,437,473	2,456,148	(994,610)	17,911,227	2,550,149	20,461,376
Ending balance, Shares at Dec. 31, 2019	12,215,545
Translation adjustment				122,489	122,489		122,489
Net income			2,977,050		2,977,050	606,484	3,583,534
Distributions to noncontrolling interests						(594,882)	(594,882)
Stock-based compensation		156,012			156,012		156,012
Common stock issued	$ 45	39,705			39,750		39,750
Common stock issued, Shares	45,000
Ending balance at Dec. 31, 2020	$ 12,261	$ 16,633,190	$ 5,433,198	$ (872,121)	$ 21,206,528	$ 2,561,751	$ 23,768,279
Ending balance, Shares at Dec. 31, 2020	12,260,545