STOCKHOLDERS' EQUITY (Details)		12 Months Ended
	Nov. 30, 2015 USD ($) shares	Dec. 31, 2017 USD ($) item $ / shares shares	Dec. 31, 2016 USD ($) $ / shares shares	Dec. 31, 2015 USD ($)
Stock repurchase program
Number of classes of preferred stock outstanding | item		1
Dividend paid | $		$ 220,450	$ 220,755	$ 283,543
Common stock authorized (in shares) | shares		100,000,000	100,000,000
Common stock outstanding (in shares) | shares		32,666,454	29,666,454
Preferred Class A
Stock repurchase program
Preferred stock authorized (in shares) | shares		5,000,000
Preferred stock par value (in dollars per share)		$ 1
Preferred Class B
Stock repurchase program
Preferred stock authorized (in shares) | shares		5,000,000	5,000,000
Preferred stock par value (in dollars per share)		$ 1	$ 1
Number of series of preferred stock class B | item		5
Preferred stock, remaining authorized shares to which series have Not been assigned | shares		4,218,555
Series I, Class B
Stock repurchase program
Preferred stock par value (in dollars per share)		$ 1	$ 1
Preferred stock outstanding (in shares) | shares		98,500	98,500
Cumulative annual dividend payable quarterly (in dollars per share)		$ 0.50
Dividend paid | $		$ 49,250	$ 49,250	62,516
Preferred stock dividend in arrears | $		$ 0
Period after which stock is redeemable at the option of the entity		3 years
Preferred stock redemption price (in dollars per share)		$ 7.50
Preferred stock conversion ratio		1
Period after which stock can be converted at the option of the stockholders		3 years
Number of shares of preferred stock converted into common stock | shares		0	0
Amount per share the holders of the preferred stock entitled to in voluntary or involuntary dissolution, liquidation or winding up of the Company (in dollars per share)		$ 6.25
Series II, Class B
Stock repurchase program
Preferred stock par value (in dollars per share)		$ 1	$ 1
Preferred stock outstanding (in shares) | shares		171,200	171,200
Cumulative annual dividend payable quarterly (in dollars per share)		$ 1.00
Dividend paid | $		$ 171,200	$ 171,200	$ 221,026
Preferred stock dividend in arrears | $		$ 0
Period after which stock is redeemable at the option of the entity		3 years
Preferred stock redemption price (in dollars per share)		$ 15.00
Preferred stock conversion ratio		1
Period after which stock can be converted at the option of the stockholders		3 years
Number of shares of preferred stock converted into common stock | shares		0
Amount per share the holders of the preferred stock entitled to in voluntary or involuntary dissolution, liquidation or winding up of the Company (in dollars per share)		$ 12.50
Number of consecutive quarters in which preferred stockholders have no voting right until dividends are in arrears | item		12
Right of preferred stock holders to elect a specified proportion of board of directors		0.33
Series III, Class B
Stock repurchase program
Preferred stock par value (in dollars per share)		$ 1	$ 1
Preferred stock outstanding (in shares) | shares		129,245	129,245
Cumulative annual dividend payable quarterly (in dollars per share)		$ 1.00
Preferred stock dividend in arrears | $		$ 4,145,604
Period after which stock is redeemable at the option of the entity		3 years
Preferred stock redemption price (in dollars per share)		$ 15.00
Preferred stock conversion ratio		1
Period after which stock can be converted at the option of the stockholders		3 years
Number of shares of preferred stock converted into common stock | shares		0
Amount per share the holders of the preferred stock entitled to in voluntary or involuntary dissolution, liquidation or winding up of the Company (in dollars per share)		$ 12.50
Series IV, Class B
Stock repurchase program
Preferred stock par value (in dollars per share)		$ 1	$ 1
Preferred stock outstanding (in shares) | shares		342,500	342,500
Cumulative annual dividend payable quarterly (in dollars per share)		$ 1.00
Preferred stock dividend in arrears | $	$ 3,094,795	$ 6,141,118
Period after which stock is redeemable at the option of the entity		3 years
Preferred stock redemption price (in dollars per share)		$ 11.00
Preferred stock conversion ratio		1
Period after which stock can be converted at the option of the stockholders		3 years
Number of shares of preferred stock converted into common stock | shares		0	0
Amount per share the holders of the preferred stock entitled to in voluntary or involuntary dissolution, liquidation or winding up of the Company (in dollars per share)		$ 11.00
Number of shares issued for convertible preferred stock | shares	728,000
Series V, Class B
Stock repurchase program
Preferred stock par value (in dollars per share)		$ 1	$ 1
Preferred stock outstanding (in shares) | shares		40,000	40,000
Cumulative annual dividend payable quarterly (in dollars per share)		$ 0.32
Preferred stock dividend in arrears | $		$ 996,035
Period after which stock is redeemable at the option of the entity		2 years
Preferred stock redemption price (in dollars per share)		$ 4.40
Number of shares of preferred stock converted into common stock | shares		0	0
Amount per share the holders of the preferred stock entitled to in voluntary or involuntary dissolution, liquidation or winding up of the Company (in dollars per share)		$ 4.40
Preferred Class C
Stock repurchase program
Preferred stock authorized (in shares) | shares		5,000,000
Preferred stock par value (in dollars per share)		$ 1
Common Stock
Stock repurchase program
Common stock authorized (in shares) | shares		100,000,000	100,000,000
Common stock no par value (in dollars per share)		$ 0	$ 0
Common stock outstanding (in shares) | shares		32,666,454	29,666,454
Number of shares issued for convertible preferred stock | shares		2,644,464