CONDENSED STATEMENTS OF SHAREHOLDERS' EQUITY (UNAUDITED) - USD ($)	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total
Balance, beginning at Dec. 31, 2016	$ 8,738	$ 52,824,950	$ 14,781,018	$ (9,000)	$ 67,605,706
Balance, beginning (in shares) at Dec. 31, 2016	8,739,836
Net income			3,710,461		3,710,461
Change in unrealized loss from interest rate swap				1,900	1,900
Stock-based compensation expense	$ 109	787,181			787,290
Stock-based compensation expense (in shares)	106,981
Balance, ending at Sep. 30, 2017	$ 8,847	53,612,131	18,491,479	(7,100)	72,105,357
Balance, ending (in shares) at Sep. 30, 2017	8,846,817
Balance, beginning at Dec. 31, 2017	$ 8,863	53,770,618	20,548,652	(14,800)	$ 74,313,333
Balance, beginning (in shares) at Dec. 31, 2017	8,864,319				8,864,319
Net income			3,842,143		$ 3,842,143
Change in unrealized loss from interest rate swap				$ 14,800	14,800
Common stock issued as employee compensation	$ 5	45,908			45,913
Common stock issued as employee compensation (in shares)	5,130
Stock-based compensation expense	$ 82	536,088			536,170
Stock-based compensation expense (in shares)	83,688
Balance, ending at Sep. 30, 2018	$ 8,950	$ 54,352,614	$ 24,390,795		$ 78,752,359
Balance, ending (in shares) at Sep. 30, 2018	8,953,137				8,953,137