Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)	Common Stock [Member] Common Class A [Member] Cumulative Effect, Period of Adoption, Adjustment [Member]	Common Stock [Member] Common Class A [Member]	Common Stock [Member] Common Class B [Member] Cumulative Effect, Period of Adoption, Adjustment [Member]	Common Stock [Member] Common Class B [Member]	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] Cumulative Effect, Period of Adoption, Adjustment [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member] Common Class A [Member]	Treasury Stock [Member] Common Class B [Member]	Treasury Stock [Member] Cumulative Effect, Period of Adoption, Adjustment [Member]	Treasury Stock [Member]	Retained Earnings [Member] Cumulative Effect, Period of Adoption, Adjustment [Member]	Retained Earnings [Member]	Common Stock Outstanding [Member] Common Class A [Member]	Common Stock Outstanding [Member] Common Class B [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member]	Total
Balance at Dec. 31, 2018		$ 2,641,300		$ 710,272				$ 1,741,901				$ (1,905,780)	$ (73,126)	$ 9,577,792			$ (73,126)	$ 12,765,485
Share-based compensation expense		99,642																99,642
Stock awards		204,700																204,700
Net Income														5,271,805				5,271,805
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)					39,000										39,000
Repurchase of shares (in shares)
Note conversion				648,000														648,000
Note conversion (in shares)						100,000										100,000
Balance at Sep. 30, 2019		2,945,642		1,358,272				1,741,901				(1,905,780)		14,776,471				18,916,506
Balance (in shares) at Sep. 30, 2019					2,200,014	879,283			37,208	182,435					2,162,806	696,848
Balance at Jun. 30, 2019		2,907,342		710,272				1,741,901				(1,905,780)		13,081,603				16,535,338
Share-based compensation expense		38,300																38,300
Stock awards
Repurchase of shares
Net Income														1,694,868				1,694,868
Balance (in shares) at Jun. 30, 2019					2,200,014	779,283			37,208	182,435					2,162,806	596,848
Stock awards (in shares)
Repurchase of shares (in shares)
Note conversion				648,000														648,000
Note conversion (in shares)						100,000										100,000
Balance at Sep. 30, 2019		2,945,642		1,358,272				1,741,901				(1,905,780)		14,776,471				18,916,506
Balance (in shares) at Sep. 30, 2019					2,200,014	879,283			37,208	182,435					2,162,806	696,848
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
Repurchase of shares												(29,032)						(29,032)
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 (in shares)					15,000										15,000
Repurchase of shares (in shares)									2,097						(2,097)
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	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				(1,934,032)		18,831,490				23,970,715
Share-based compensation expense		6,975																6,975
Stock awards
Repurchase of shares
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
Stock awards (in shares)
Repurchase of shares (in shares)
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	2,591,837	954,283			39,305	182,435					2,552,532	771,848