SHAREHOLDER'S EQUITY (Details) - USD ($)	1 Months Ended									3 Months Ended																12 Months Ended
	Dec. 15, 2017	Nov. 17, 2017	Sep. 15, 2017	Aug. 30, 2017	Jun. 15, 2017	Mar. 15, 2017	Dec. 15, 2016	Sep. 15, 2016	Jun. 15, 2016	Dec. 31, 2017	Oct. 16, 2017	Sep. 30, 2017	Jul. 16, 2017	Jun. 30, 2017	Apr. 16, 2017	Mar. 31, 2017	Jan. 16, 2017	Dec. 31, 2016	Oct. 16, 2016	Sep. 30, 2016	Jul. 16, 2016	Jun. 30, 2016	Apr. 16, 2016	Mar. 31, 2016	Jan. 16, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Conversion Of Class B Common Stock [Abstract]
Conversion of Class B common stock to Class A common stock (Share)																										3,152,333
Dividends And Shares Activitiy [Line Items]
Dvidend Equivalent liability - short term										$ 830,000								$ 260,000								$ 830,000	$ 260,000
Dvidend Equivalent liability - long term										1,331,000								348,000								1,331,000	348,000
Total Dividend Equivalent Liability										$ 2,161,000								608,000								$ 2,161,000	$ 608,000
CommonStockDividendsPerShareDeclared	$ 0.09		$ 0.075	$ 0.2	$ 0.075	$ 0.075	$ 0.075	$ 0.075	$ 0.075																	$ 0.36	$ 0.3
Dividend payments	$ 12,633,039		$ 2,921,727	$ 7,791,075	$ 2,920,860	$ 2,915,952	$ 2,891,608	$ 2,886,179	$ 2,885,838																	$ 29,296,000	$ 8,666,000	$ 0
Shares of stock deemed repurchased																										169,000	232,000	132,000
Amount recorded as financing activity																										$ (2,565,000)	$ (2,268,000)	$ (1,562,000)
The total cost to repurchase																										(10,675,000)	0	0
Dividends paid on preferred stock		$ 236,806									$ 687,500		$ 550,000		$ 550,000		$ 550,000		$ 550,000		$ 412,500		$ 412,500		$ 412,500	$ 2,574,000	1,788,000	752,000
Employee stock purchase plan, authorized shares										1,000,000																1,000,000
Stock Issued During Period Value Employee Stock Purchase Plan																										$ 182,000	379,000	0
Total Non cash compensation expense recognized																										$ 6,239,000	4,218,000	3,488,000
Espp Shares Market Value										85.00%																85.00%
Espp Share Discount										15.00%																15.00%
PreferredStockDividendsPerShareDeclared		$ 21,527.78									$ 62,500		$ 50,000		$ 50,000		$ 50,000		$ 50,000		$ 37,500		$ 37,500		$ 37,500
PaymentsOfDividendsAbstract
Payments of Dividends, Common Stock	$ 12,633,039		$ 2,921,727	$ 7,791,075	$ 2,920,860	$ 2,915,952	$ 2,891,608	$ 2,886,179	$ 2,885,838																	$ 29,296,000	8,666,000	0
PaymentsOfDividendsPreferredStockAndPreferenceStock										$ 924,000		$ 550,000		$ 550,000		$ 550,000		$ 550,000		$ 413,000		$ 413,000		$ 412,000		2,574,000	$ 1,788,000	$ 413,000
Treasury Stock Line Items
Stock Repurchase Prgram Authorized Amount										$ 100,000,000																$ 100,000,000
Shares repurchased during period																										932,600
Average Cost per share of Acquired Treasury Shares																										$ 11.45
ESPP [Member]
Dividends And Shares Activitiy [Line Items]
Stock Issued During Period Shares Employee Stock Purchase Plans																										15,000	32,000	0
Total Non cash compensation expense recognized																										$ 32,000	$ 67,000	$ 0