Consolidated Statements of Stockholders' Equity - USD ($)	Common Stock Including Additional Paid in Capital [Member] Common Class A [Member]	Common Stock Including Additional Paid in Capital [Member] Common Class B [Member]	Treasury Stock [Member] Common Class A [Member]	Treasury Stock [Member] Common Class B [Member]	Treasury Stock [Member]	Common Stock Outstanding [Member] Common Class A [Member]	Common Stock Outstanding [Member] Common Class B [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Total
Balance at Dec. 31, 2018	$ 2,641,300	$ 710,272			$ (1,905,780)			$ 1,741,901	$ 9,577,792	$ 12,765,485
Share-based compensation expense	348,877									348,877
Warrant exercise	250,000									250,000
Note conversion	359,629	755,250								1,114,879
Cumulative effect of accounting change related to lease standard									(30,572)	(30,572)
Net Income									6,979,863	6,979,863
Balance at Dec. 31, 2019	$ 3,599,806	$ 1,465,522			(1,905,780)			1,741,901	16,527,083	21,428,532
Balance (in shares) at Dec. 31, 2018	2,161,014	779,283	37,208	182,435		2,123,806	596,848
Stock awards (in shares)	64,334					64,334
Stock Issued During Period, Shares, Warrant Exercised (in shares)	100,000					100,000
Note conversion (in shares)	251,489	175,000				251,489	175,000
Balance (in shares) at Dec. 31, 2019	2,576,837	954,283	37,208	182,435		2,539,629	771,848
Share-based compensation expense	$ 70,849									70,849
Net Income									5,839,387	5,839,387
Stock awards	226,050									226,050
Repurchase of shares					(32,272)					(32,272)
Balance at Dec. 31, 2020	$ 3,896,705	$ 1,465,522			$ (1,938,052)			$ 1,741,901	$ 22,366,470	$ 27,532,546
Stock awards (in shares)	17,250					17,250
Stock option exercise (in shares)						1,000
Share repurchase (in shares)			2,259			(2,259)
Balance (in shares) at Dec. 31, 2020	2,595,087	954,283	39,467	182,435		2,555,620	771,848