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STOCKHOLDERS' EQUITY (Details) | 12 Months Ended
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Dec. 31, 2018 USD ($) item $ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2016 USD ($)
Stock repurchase program |  |  |
Number of classes of preferred stock outstanding | item | 1 |  |
Dividend paid | $ | $ 220,450 | $ 220,450 | $ 220,755
Common stock authorized (in shares) | shares | 100,000,000 | 100,000,000 |
Common stock outstanding (in shares) | shares | 32,666,454 | 32,666,454 |
Preferred Class A |  |  |
Stock repurchase program |  |  |
Preferred stock authorized (in shares) | shares | 5,000,000 |  |
Preferred stock par value (in dollars per share) | $ 1.00 |  |
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 | 49,250
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 | $ 171,200
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 | $ | $ 4,275,000 |  |
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 | $ | $ 6,484,000 |  |
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 |  |
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 | $ | $ 1,009,000 |  |
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 | 32,666,454 |
Number of shares issued for convertible preferred stock | shares | 2,139,248 |  |

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