Consolidated Statements of Stockholders' Equity (Unaudited) - 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]	Additional Paid-in Capital [Member]	Treasury Stock [Member] Common Class A [Member]	Treasury Stock [Member] Common Class B [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Common Stock Outstanding [Member] Common Class A [Member]	Common Stock Outstanding [Member] Common Class B [Member]	Total
Balance at Dec. 31, 2019	$ 3,599,806	$ 1,465,522	$ 1,741,901			$ (1,905,780)	$ 16,527,083			$ 21,428,532
Share-based compensation expense	62,733									62,733
Stock awards	$ 211,050									211,050
Net Income							3,730,497			3,730,497
Balance (in shares) at Dec. 31, 2019	2,576,837	954,283		37,208	182,435			2,539,629	771,848
Stock awards	$ 211,050									211,050
Repurchase of shares						(29,032)				(29,032)
Net Income							3,730,497			3,730,497
Stock awards (in shares)	15,000							15,000
Repurchase of shares (in shares)				2,097				(2,097)
Repurchase of shares						(29,032)				(29,032)
Balance at Sep. 30, 2020	$ 3,873,589	$ 1,465,522	1,741,901			(1,934,812)	20,257,580			25,403,780
Balance (in shares) at Sep. 30, 2020	2,591,837	954,283		39,305	182,435			2,552,532	771,848
Balance at Jun. 30, 2020	$ 3,866,614	$ 1,465,522	1,741,901			(1,934,812)	18,831,490			23,970,715
Share-based compensation expense	$ 6,975									6,975
Net Income							1,426,090			1,426,090
Balance (in shares) at Jun. 30, 2020	2,591,837	954,283		39,305	182,435			2,552,532	771,848
Net Income							1,426,090			1,426,090
Balance at Sep. 30, 2020	$ 3,873,589	$ 1,465,522	1,741,901			(1,934,812)	20,257,580			25,403,780
Balance (in shares) at Sep. 30, 2020	2,591,837	954,283		39,305	182,435			2,552,532	771,848
Balance at Dec. 31, 2020	$ 3,896,705	$ 1,465,522	1,741,901			(1,938,052)	22,366,470			27,532,546
Share-based compensation expense	37,419									37,419
Stock awards	$ 385,544									385,544
Net Income							5,588,599			5,588,599
Balance (in shares) at Dec. 31, 2020	2,595,087	954,283		39,467	182,435			2,555,620	771,848
Stock awards	$ 385,544									385,544
Issuance for acquisition	$ 1,059,000									1,059,000
Repurchase of shares						(41,033)				(41,033)
Net Income							5,588,599			5,588,599
Stock awards (in shares)	23,700							23,700
Acquisition (in shares)	60,000							60,000
Stock conversion, shares issued (in shares)	40,000
Stock conversion, shares converted (in shares)		(40,000)
Stock conversion (in shares)								40,000	(40,000)
Repurchase of shares (in shares)				2,262				(2,262)
Repurchase of shares						(41,033)				(41,033)
Balance at Sep. 30, 2021	$ 5,378,667	$ 1,465,522	1,741,901			(1,979,085)	27,955,070			34,562,075
Balance (in shares) at Sep. 30, 2021	2,718,787	914,283		41,729	182,435			2,677,058	731,848
Balance at Jun. 30, 2021	$ 5,365,581	$ 1,465,522	1,741,901			(1,979,085)	26,757,193			33,351,112
Share-based compensation expense	7,418									7,418
Stock awards	$ 5,668									5,668
Net Income							1,197,877			1,197,877
Balance (in shares) at Jun. 30, 2021	2,718,787	914,283		41,729	182,435			2,677,058	731,848
Stock awards	$ 5,668									5,668
Net Income							1,197,877			1,197,877
Balance at Sep. 30, 2021	$ 5,378,667	$ 1,465,522	$ 1,741,901			$ (1,979,085)	$ 27,955,070			$ 34,562,075
Balance (in shares) at Sep. 30, 2021	2,718,787	914,283		41,729	182,435			2,677,058	731,848