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CONDENSED BALANCE SHEETS (USD $)
Jun. 30, 2013
Dec. 31, 2012
Current assets:    
Cash and cash equivalents $ 19,686,834 $ 25,963,313
Accounts receivable, net 4,305,976 3,694,307
Inventories, net 5,940,665 4,990,253
Income taxes receivable 9,431 9,431
Other current assets 303,616 783,760
Total current assets 30,246,522 35,441,064
Property, plant, and equipment, net 11,439,275 11,899,650
Intangible and other assets, net 284,601 291,444
Total assets 41,970,398 47,632,158
Current liabilities:    
Accounts payable 3,835,641 5,099,884
Current portion of long-term debt 304,486 315,086
Accrued compensation 714,104 809,592
Dividends payable 57,613 57,613
Accrued royalties to shareholders 567,544 129,107
Other accrued liabilities 1,434,732 1,665,670
Income taxes payable 3,751  
Total current liabilities 6,917,871 8,076,952
Long-term debt, net of current maturities 3,680,405 3,826,210
Total liabilities 10,598,276 11,903,162
Commitments and contingencies - see Note 6      
Preferred stock $1 par value:    
Common stock, no par value      
Additional paid-in capital 58,561,465 58,617,308
Retained deficit (27,615,931) (23,767,662)
Common stock in treasury - at cost (568,357) (122,202)
Total stockholders' equity 31,372,122 35,728,996
Total liabilities and stockholders' equity 41,970,398 47,632,158
Series I, Class B
    
Preferred stock $1 par value:    
Preferred Stock 103,500 103,500
Series II, Class B
    
Preferred stock $1 par value:    
Preferred Stock 178,700 178,700
Series III, Class B
    
Preferred stock $1 par value:    
Preferred Stock 130,245 130,245
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 $ 46,607