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STOCKHOLDERS' EQUITY (Details) | 12 Months Ended
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Dec. 31, 2020 USD ($) item $ / shares shares | Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2018 USD ($)
Stock repurchase program |  |  |
Number of classes of preferred stock outstanding | item | 1 |  |
Dividend paid | $ | $ 216,642 | $ 219,825 | $ 220,450
Stock Redeemed or Called During Period, Value | $ | $ 107,250 |  |
Common stock authorized (in shares) | shares | 100,000,000 | 100,000,000 |
Common stock outstanding (in shares) | shares | 33,957,204 | 32,674,954 |
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) | $ 1.00 |  |
Number of series of preferred stock class B | item | 2 |  |
Preferred stock, remaining authorized shares to which series have Not been assigned | shares | 4,737,055 |  |
Series I, Class B |  |  |
Stock repurchase program |  |  |
Preferred stock par value (in dollars per share) | $ 1 |  |
Preferred stock outstanding (in shares) | shares | 0 | 96,000 |
Cumulative annual dividend payable quarterly (in dollars per share) | $ 0.50 |  |
Dividend paid | $ | $ 48,000 | $ 48,625 |
Preferred stock dividend in arrears | $ | $ 0 |  |
Preferred stock redemption price (in dollars per share) | $ 7.50 |  |
Preferred stock conversion ratio | 1 |  |
Number of shares of preferred stock converted into common stock | shares | 81,700 | 2,500 |
Stock Redeemed or Called During Period, Value | $ | $ 107,250 |  |
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 | 156,200 | 171,200 |
Cumulative annual dividend payable quarterly (in dollars per share) | $ 1.00 |  |
Dividend paid | $ | $ 168,642 | $ 171,200 |
Preferred stock dividend in arrears | $ | $ 0 |  |
Preferred stock redemption price (in dollars per share) | $ 15.00 |  |
Preferred stock conversion ratio | 1 |  |
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 | 12 |  |
Right of preferred stock holders to elect a specified proportion of board of directors | 0.33 |  |
Series III Preferred Stock |  |  |
Stock repurchase program |  |  |
Preferred stock par value (in dollars per share) | $ 1 | $ 1 |
Preferred stock outstanding (in shares) | shares | 106,745 | 129,245 |
Cumulative annual dividend payable quarterly (in dollars per share) | $ 1.00 |  |
Preferred stock dividend in arrears | $ | $ 4,037,000 |  |
Preferred stock redemption price (in dollars per share) | $ 15.00 |  |
Preferred stock conversion ratio | 1 |  |
Number of shares of preferred stock converted into common stock | shares | 22,500 |  |
Exchanged for Common Stock | shares | 22,500 |  |
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 Preferred Stock |  |  |
Stock repurchase program |  |  |
Preferred stock par value (in dollars per share) | $ 1 | $ 1 |
Preferred stock outstanding (in shares) | shares | 0 | 342,500 |
Cumulative annual dividend payable quarterly (in dollars per share) | $ 1.00 |  |
Preferred stock dividend in arrears | $ | $ 101,000 |  |
Preferred stock redemption price (in dollars per share) | $ 11.00 |  |
Preferred stock conversion ratio | 1 |  |
Exchanged for Common Stock | shares | 342,500 |  |
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 Preferred Stock |  |  |
Stock repurchase program |  |  |
Preferred stock par value (in dollars per share) | $ 1 | $ 1 |
Preferred stock outstanding (in shares) | shares | 0 | 34,000 |
Cumulative annual dividend payable quarterly (in dollars per share) | $ 0.32 |  |
Preferred stock dividend in arrears | $ | $ 830,000 |  |
Preferred stock redemption price (in dollars per share) | $ 4.40 |  |
Number of shares of preferred stock converted into common stock | shares | 0 | 6,000 |
Exchanged for Common Stock | shares | 34,000 |  |
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) | $ 1.00 |  |
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 | 33,957,204 | 32,674,954 |
Number of shares issued for convertible preferred stock | shares | 462,395 |  |

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