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CONDENSED BALANCE SHEETS - USD ($)
Jun. 30, 2020
Dec. 31, 2019
Current assets:    
Cash and cash equivalents $ 5,305,098 $ 5,934,749
Accounts receivable, net 8,460,469 6,564,371
Investments in debt and equity securities, at fair value 10,760,830 7,771,660
Inventories, net 9,395,606 7,450,592
Income taxes receivable 100,785 50,392
Other current assets 624,284 635,201
Total current assets 34,647,072 28,406,965
Property, plant, and equipment, net 10,586,697 10,632,057
Income taxes receivable   50,393
Deferred taxes 1,801,996  
Other assets 47,266 88,315
Total assets 47,083,031 39,177,730
Current liabilities:    
Accounts payable 7,190,442 5,007,604
Current portion of long-term debt 874,471 260,939
Accrued compensation 783,702 607,339
Dividends payable 54,800 54,800
Accrued royalties to shareholder 951,532 921,445
Other accrued liabilities 1,109,603 1,387,149
Income taxes payable 70,607 17,944
Total current liabilities 11,035,157 8,257,220
Long-term debt, net of current maturities 2,999,446 2,378,055
Total liabilities 14,034,603 10,635,275
Commitments and contingencies - see Note 7
Preferred stock, $1 par value:    
Common stock, no par value
Additional paid-in capital 62,087,831 61,660,744
Accumulated deficit (29,802,348) (33,891,234)
Total stockholders' equity 33,048,428 28,542,455
Total liabilities and stockholders' equity 47,083,031 39,177,730
Series I, Class B    
Preferred stock, $1 par value:    
Preferred stock 96,000 96,000
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 126,745 129,245
Series IV, Class B    
Preferred stock, $1 par value:    
Preferred stock 335,000 342,500
Series V, Class B    
Preferred stock, $1 par value:    
Preferred stock $ 34,000 $ 34,000