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CONDENSED BALANCE SHEETS - USD ($)
Mar. 31, 2020
Dec. 31, 2019
Current assets:    
Cash and cash equivalents $ 7,605,134 $ 5,934,749
Accounts receivable, net 5,193,840 6,564,371
Investments in debt and equity securities, at fair value 7,649,081 7,771,660
Inventories, net 6,373,132 7,450,592
Income taxes receivable 100,785 50,392
Other current assets 669,767 635,201
Total current assets 27,591,739 28,406,965
Property, plant, and equipment, net 10,607,718 10,632,057
Income taxes receivable   50,393
Other assets 67,832 88,315
Total assets 38,267,289 39,177,730
Current liabilities:    
Accounts payable 4,434,967 5,007,604
Current portion of long-term debt 264,579 260,939
Accrued compensation 774,659 607,339
Dividends payable 54,800 54,800
Accrued royalties to shareholder 869,108 921,445
Other accrued liabilities 822,882 1,387,149
Income taxes payable 618 17,944
Total current liabilities 7,221,613 8,257,220
Long-term debt, net of current maturities 2,310,248 2,378,055
Total liabilities 9,531,861 10,635,275
Commitments and contingencies - See Note 8
Preferred stock, $1 par value:    
Common stock, no par value
Additional paid-in capital 61,538,444 61,660,744
Accumulated deficit (33,568,461) (33,891,234)
Total stockholders' equity 28,735,428 28,542,455
Total liabilities and stockholders' equity 38,267,289 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 337,500 342,500
Series V, Class B    
Preferred stock, $1 par value:    
Preferred stock $ 34,000 $ 34,000