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CONDENSED BALANCE SHEETS - USD ($)
Jun. 30, 2015
Dec. 31, 2014
Current assets:    
Cash and cash equivalents $ 19,715,134 $ 22,128,977
Restricted cash 601,492 600,897
Accounts receivable, net 3,820,681 5,642,091
Inventories, net 5,504,764 4,663,548
Other current assets 1,028,821 1,194,055
Total current assets 30,670,892 34,229,568
Property, plant and equipment, net 11,116,806 10,852,853
Intangible and other assets, net 266,057 270,693
Total assets 42,053,755 45,353,114
Current liabilities:    
Accounts payable 4,307,497 5,142,796
Litigation proceeds subject to stipulation   7,724,826
Current portion of long-term debt 154,391 149,744
Accrued compensation 770,176 504,188
Dividends payable 56,363  
Accrued royalties to shareholders 557,959 787,434
Other accrued liabilities 1,086,842 782,322
Income taxes payable 10,397 8,290
Total current liabilities 6,943,625 15,099,600
Long-term debt, net of current maturities 3,345,585 3,425,028
Total liabilities $ 10,289,210 $ 18,524,628
Commitments and contingencies - See Note 6    
Preferred stock $1 par value:    
Common Stock, no par value    
Additional paid-in capital $ 59,312,543 $ 59,273,769
Retained deficit (27,437,834) (32,336,119)
Common stock in treasury - at cost (1,096,609) (1,096,609)
Total stockholders' equity 31,764,545 26,828,486
Total liabilities and stockholders' equity 42,053,755 45,353,114
Series I, Class B    
Preferred stock $1 par value:    
Preferred stock 98,500 98,500
Series II, Class B    
Preferred stock $1 par value:    
Preferred stock 176,200 176,200
Series III, Class B    
Preferred stock $1 par value:    
Preferred stock 129,245 130,245
Series IV, Class B    
Preferred stock $1 par value:    
Preferred stock 542,500 542,500
Series V, Class B    
Preferred stock $1 par value:    
Preferred stock $ 40,000 $ 40,000