Consolidated Statements of Shareholders' Equity - USD ($)	Common Stock	Additional Paid In Capital	Accumulated Other Comprehensive Loss	Retained Earnings	Total
Beginning balance at Dec. 31, 2018	$ 93,382	$ 10,235,827	$ (295,734)	$ 17,399,776	$ 27,433,251
Beginning balance, shares at Dec. 31, 2018	9,338,191
Net income				3,498,714	3,498,714
Dividends, common stock				(468,306)	(468,306)
Options exercised	$ 279	13,520			13,799
Options exercised, shares	27,928
Stock based compensation	$ 830	274,710			275,540
Stock based compensation, shares	83,000
Shares withheld in consideration of employee tax obligations related to stock-based compensation	$ (63)	(20,886)			(20,949)
Shares withheld in consideration of employee tax obligations related to stock-based compensation, shares	(6,310)
Cumulative effect adjustment on adoption of ASU 2016-02 Leases (Topic 842)				972	972
Foreign currency translation adjustment			1,243		1,243
Ending Balance at Dec. 31, 2019	$ 94,428	10,503,171	(294,491)	20,431,156	30,734,264
Ending balance, shares at Dec. 31, 2019	9,442,809
Net income				9,616,683	9,616,683
Dividends, common stock				(757,362)	(757,362)
Options exercised	$ 153	20,547			20,700
Options exercised, shares	15,296
Stock based compensation	$ 252	312,358			312,610
Stock based compensation, shares	25,150
Shares withheld in consideration of employee tax obligations related to stock-based compensation	$ (15)	(19,976)			(19,991)
Shares withheld in consideration of employee tax obligations related to stock-based compensation, shares	(1,456)
Foreign currency translation adjustment			167		167
Ending Balance at Dec. 31, 2020	$ 94,818	$ 10,816,100	$ (294,324)	$ 29,290,477	$ 39,907,071
Ending balance, shares at Dec. 31, 2020	9,481,799