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BALANCE SHEETS (Parenthetical) - USD ($)
Mar. 31, 2016
Dec. 31, 2015
SHAREHOLDERS' EQUITY    
Common stock, par value $ 0 $ 0
Common stock, authorized shares 10,000,000 10,000,000
Common stock, issued shares 5,176,020 5,139,177
Common stock, outstanding shares 5,008,885 4,989,216
Common stock held in treasury 167,135 149,961
Preferred stock, par value $ 0 $ 0
Preferred stock, authorized shares 10,000,000 10,000,000
Preferred stock, issued shares 1,434,448 1,074,338
Preferred stock, outstanding shares 1,434,448 1,074,338
Preferred stock, liquidation preference $ 6,031,854 $ 4,458,710