CONSOLIDATED STATEMENTS OF SHAREHOLDERS’ EQUITY - USD ($)	Common Stock	Treasury Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Total
Balance at Dec. 31, 2017	$ 5,963,850	$ (22,507,760)	$ 22,735,228	$ 177,614,274	$ 372,616	$ 184,178,208
Increase (decrease) in shareholders' equity
Net Income				25,371,379		25,371,379
Stock Repurchase		(3,977,005)				(3,977,005)
Exercise of Stock Options	8,520		189,849			198,369
Vested Restricted Stock	19,065		(517,439)			(498,374)
Stock Issuance	2,781		171,098			173,879
Stock Compensation Expense from Restricted Stock Grants and Equity Classified Stock Options			1,283,434			1,283,434
Cash Dividends				(1,049,002)		(1,049,002)
Other Comprehensive Income (Loss), Net of Income Tax					331,126	331,126
Balance at Sep. 30, 2018	5,994,216	(26,484,765)	23,862,170	201,936,651	703,742	206,012,014
Balance at Jun. 30, 2018	5,984,747	(24,700,205)	23,228,788	202,024,986	681,426	207,219,742
Increase (decrease) in shareholders' equity
Net Income				296,172		296,172
Stock Repurchase		(1,784,560)				(1,784,560)
Exercise of Stock Options	8,520		189,849			198,369
Stock Issuance	949		57,424			58,373
Stock Compensation Expense from Restricted Stock Grants and Equity Classified Stock Options			386,109			386,109
Cash Dividends				(384,507)		(384,507)
Other Comprehensive Income (Loss), Net of Income Tax					22,316	22,316
Balance at Sep. 30, 2018	5,994,216	(26,484,765)	23,862,170	201,936,651	703,742	206,012,014
Balance at Dec. 31, 2018	5,995,257	(32,345,002)	24,326,778	213,297,897	486,543	211,761,473
Increase (decrease) in shareholders' equity
Net Income				18,550,919		18,550,919
Stock Repurchase		(31,096,662)				(31,096,662)
Vested Restricted Stock	12,957		(316,272)			(303,315)
Stock Issuance	7,653		434,867			442,520
Stock Compensation Expense from Restricted Stock Grants and Equity Classified Stock Options			1,616,648			1,616,648
Cash Dividends				(1,564,523)		(1,564,523)
Other Comprehensive Income (Loss), Net of Income Tax					(405,138)	(405,138)
Balance at Sep. 30, 2019	6,015,867	(63,441,664)	26,062,021	230,284,293	81,405	199,001,922
Balance at Jun. 30, 2019	6,014,536	(63,441,664)	25,450,060	229,333,766	143,712	197,500,410
Increase (decrease) in shareholders' equity
Net Income				1,486,022		1,486,022
Stock Issuance	1,331		77,944			79,275
Stock Compensation Expense from Restricted Stock Grants and Equity Classified Stock Options			534,017			534,017
Cash Dividends				(535,495)		(535,495)
Other Comprehensive Income (Loss), Net of Income Tax					(62,307)	(62,307)
Balance at Sep. 30, 2019	$ 6,015,867	$ (63,441,664)	$ 26,062,021	$ 230,284,293	$ 81,405	$ 199,001,922