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CONDENSED BALANCE SHEETS - USD ($)
Sep. 30, 2019
Dec. 31, 2018
Current assets:    
Cash and cash equivalents $ 5,554,859 $ 9,647,292
Accounts receivable, net 6,296,739 4,912,356
Investments in debt and equity securities, at fair value 7,731,228 2,986,156
Inventories, net 6,746,114 7,545,094
Income taxes receivable 100,887 100,887
Other current assets 695,480 644,803
Total current assets 27,125,307 25,836,588
Property, plant, and equipment, net 10,697,780 10,851,747
Income taxes receivable 100,835 100,835
Other assets 109,195 165,856
Total assets 38,033,117 36,955,026
Current liabilities:    
Accounts payable 5,686,761 5,369,677
Current portion of long-term debt 285,715 406,361
Accrued compensation 627,408 540,852
Dividends payable 54,800 55,113
Accrued royalties to shareholder 936,458 769,324
Other accrued liabilities 1,220,801 1,467,935
Income taxes payable 17,944 10,025
Total current liabilities 8,829,887 8,619,287
Other long-term liabilities 20,899 82,359
Long-term debt, net of current maturities 2,446,345 2,639,647
Total liabilities 11,297,131 11,341,293
Preferred stock, $1 par value:    
Common Stock, no par value
Additional paid-in capital 61,715,544 61,871,756
Accumulated deficit (35,752,503) (37,039,468)
Total stockholders' equity 26,735,986 25,613,733
Total liabilities and stockholders' equity 38,033,117 36,955,026
Series I, Class B    
Preferred stock, $1 par value:    
Preferred stock 96,000 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 $ 34,000 $ 40,000