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, 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				17,064,899		17,064,899
Stock Repurchase		(31,096,662)				(31,096,662)
Exercise of Stock Options	12,957		(316,272)			(303,315)
Stock Issuance	6,322		356,924			363,246
Stock Compensation Expense from Restricted Stock Grants and Equity Classified Stock Options			1,082,630			1,082,630
Cash Dividends				(1,029,030)		(1,029,030)
Other Comprehensive Loss, Net of Income Tax					(342,831)	(342,831)
Balance at Jun. 30, 2019	6,014,536	(63,441,664)	25,450,060	229,333,766	143,712	197,500,410
Balance at Mar. 31, 2019	6,012,993	(36,470,196)	24,817,328	219,231,100	357,729	213,948,954
Increase (decrease) in shareholders' equity
Net Income				10,596,800		10,596,800
Stock Repurchase		(26,971,468)				(26,971,468)
Stock Issuance	1,543		89,572			91,115
Stock Compensation Expense from Restricted Stock Grants and Equity Classified Stock Options			543,160			543,160
Cash Dividends				(494,134)		(494,134)
Other Comprehensive Loss, Net of Income Tax					(214,017)	(214,017)
Balance at Jun. 30, 2019	6,014,536	(63,441,664)	25,450,060	229,333,766	143,712	197,500,410
Balance at Dec. 31, 2019	6,017,218	(73,440,714)	26,689,795	326,073,199	73,924	285,413,422
Increase (decrease) in shareholders' equity
Net Income				348,665		348,665
Stock Repurchase		(4,100,021)				(4,100,021)
Equity Component of Convertible Debt			5,247,550			5,247,550
Vested Restricted Stock and Performance Shares	23,892		(561,973)			(538,081)
Stock Issuance	6,283		344,647			350,930
Stock Compensation Expense from Restricted Stock Grants and Equity Classified Stock Options			1,167,993			1,167,993
Cash Dividends				(2,347,770)		(2,347,770)
Other Comprehensive Loss, Net of Income Tax					(1,866,161)	(1,866,161)
Balance at Jun. 30, 2020	6,047,393	(77,540,735)	32,888,012	324,074,094	(1,792,237)	283,676,527
Balance at Mar. 31, 2020	6,044,971	(77,355,328)	32,190,616	312,626,687	(1,299,361)	272,207,585
Increase (decrease) in shareholders' equity
Net Income				12,610,524		12,610,524
Stock Repurchase		(185,407)				(185,407)
Stock Issuance	2,422		107,367			109,789
Stock Compensation Expense from Restricted Stock Grants and Equity Classified Stock Options			590,029			590,029
Cash Dividends				(1,163,117)		(1,163,117)
Other Comprehensive Loss, Net of Income Tax					(492,876)	(492,876)
Balance at Jun. 30, 2020	$ 6,047,393	$ (77,540,735)	$ 32,888,012	$ 324,074,094	$ (1,792,237)	$ 283,676,527