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]	Retained Earnings [Member]	Total
Balance at Dec. 31, 2017	$ 2,246,367	$ 710,272	$ 1,741,901	$ (264,841)	$ 5,964,082	$ 10,397,781
Share-based compensation expense	262,167					262,167
Net Income					2,265,456	2,265,456
Proceeds from sale of business				(1,640,939)		(1,640,939)
Balance at Sep. 30, 2018	2,508,534	710,272	1,741,901	(1,905,780)	8,229,538	11,284,465
Balance at Jun. 30, 2018	2,495,534	710,272	1,741,901	(1,905,780)	6,732,459	9,774,386
Share-based compensation expense	13,000					13,000
Net Income					1,497,079	1,497,079
Balance at Sep. 30, 2018	2,508,534	710,272	1,741,901	(1,905,780)	8,229,538	11,284,465
Balance at Dec. 31, 2018	2,641,300	710,272	1,741,901	(1,905,780)	9,577,792	12,765,485
Share-based compensation expense	304,342					304,342
Net Income					5,271,805	5,271,805
Note conversion		648,000				648,000
Cumulative effect of accounting change					(73,126)	(73,126)
Balance at Sep. 30, 2019	2,945,642	1,358,272	1,741,901	(1,905,780)	14,776,471	18,916,506
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
Net Income					1,694,868	1,694,868
Note conversion		648,000				648,000
Balance at Sep. 30, 2019	$ 2,945,642	$ 1,358,272	$ 1,741,901	$ (1,905,780)	$ 14,776,471	$ 18,916,506