TREASURY STOCK (Details) - USD ($)	2 Months Ended	12 Months Ended
	Feb. 28, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 31, 2019	Jul. 18, 2018	Mar. 31, 2017
Treasury Stock
Stock repurchased amount		$ 9,837,242	$ 7,209,454	$ 7,431,896
First quarter 2017 $10 Million Repurchase Program
Treasury Stock
Stock repurchase program authorized amount	$ 10,000,000				$ 10,000,000	$ 10,000,000	$ 10,000,000
Number of shares authorized to be repurchased					10,000,000	7,100,000
Stock repurchased (in shares)	46,136	168,602
Stock repurchased amount	$ 2,700,000	$ 9,800,000	$ 4,600,000
Average price per share of stock repurchased	$ 57.82	$ 58.35