CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($)	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
BALANCE at Dec. 31, 2017	$ 205,851,840	$ 11,152,561	$ 174,008,753	$ 21,888,575	$ (1,198,049)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	3,414,771			3,414,771
Other comprehensive income (loss)	(1,371,394)				(1,371,394)
Exercise of stock options	950,521	81,245	869,276
Stock compensation expense	103,177		103,177
BALANCE at Mar. 31, 2018	208,948,915	11,233,806	174,981,206	25,303,346	(2,569,443)
BALANCE at Dec. 31, 2018	283,011,481	13,933,504	231,851,730	39,990,990	(2,764,743)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	4,731,249			4,731,249
Other comprehensive income (loss)	2,330,970				2,330,970
Issuance of stock grants and restricted stock	64,707	3,298	61,409
Exercise of stock options	199,007	14,788	184,219
Stock compensation expense	143,389		143,389
BALANCE at Mar. 31, 2019	$ 290,480,803	$ 13,951,590	$ 232,240,747	$ 44,722,239	$ (433,773)