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CONDENSED BALANCE SHEETS - USD ($)
Mar. 31, 2016
Dec. 31, 2015
Current assets:    
Cash and cash equivalents $ 18,095,633 $ 18,045,044
Accounts receivable, net 3,163,139 4,900,997
Inventories, net 6,342,992 6,296,625
Other current assets 1,071,625 1,568,032
Total current assets 28,673,389 30,810,698
Property, plant, and equipment, net 11,341,026 11,468,061
Intangible and other assets, net 261,276 262,105
Total assets 40,275,691 42,540,864
Current liabilities:    
Accounts payable 4,369,285 5,697,518
Current portion of long-term debt 252,633 249,349
Accrued compensation 942,867 763,576
Dividends payable 55,113 55,414
Accrued royalties to shareholders 505,375 631,145
Other accrued liabilities 729,247 690,535
Income taxes payable 9,932 8,176
Total current liabilities 6,864,452 8,095,713
Long-term debt, net of current maturities 3,348,562 3,417,471
Total liabilities $ 10,213,014 $ 11,513,184
Commitments and contingencies - see Note 6
Preferred stock $1 par value:    
Common Stock, no par value
Additional paid-in capital $ 58,242,124 $ 58,268,036
Retained deficit (28,960,892) (28,021,801)
Total stockholders' equity 30,062,677 31,027,680
Total liabilities and stockholders' equity 40,275,691 42,540,864
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 171,200 171,200
Series III, Class B    
Preferred stock $1 par value:    
Preferred stock 129,245 129,245
Series IV, Class B    
Preferred stock $1 par value:    
Preferred stock 342,500 342,500
Series V, Class B    
Preferred stock $1 par value:    
Preferred stock $ 40,000 $ 40,000