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CONDENSED STATEMENTS OF CASH FLOWS - USD ($)
 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Cash flows from operating activities    
Net income (loss) $ 1,286,965 $ (1,190,407)
Adjustments to reconcile net income (loss) to net cash provided (used) by operating activities:    
Depreciation and amortization 641,224 669,584
Realized gains on investments (7,925)  
Net unrealized gains on investments (129,728)  
(Increase) decrease in operating assets:    
Accounts receivable (1,384,383) 629,861
Inventories 798,980 (1,179,252)
Other current assets (50,677) 13,624
Other assets 56,661  
Increase (decrease) in operating liabilities:    
Accounts payable 317,084 (49,414)
Other accrued liabilities (54,904) 821,128
Insurance proceeds   (153,869)
Income taxes payable 7,919 (1,173)
Net cash provided (used) by operating activities 1,481,216 (439,918)
Cash flows from investing activities    
Purchase of property, plant, and equipment (487,256) (290,153)
Purchase of debt and equity securities (6,969,552)  
Proceeds from the sales on investments 2,362,134  
Net cash used by investing activities (5,094,674) (290,153)
Cash flows from financing activities    
Repayments of long-term debt (313,949) (341,795)
Payment of preferred stock dividends (165,026) (165,337)
Net cash used by financing activities (478,975) (507,132)
Net decrease in cash and cash equivalents (4,092,433) (1,237,203)
Cash and cash equivalents at:    
Beginning of period 9,647,292 14,877,899
End of period 5,554,859 13,640,696
Supplemental schedule of cash flow information:    
Interest paid 130,085 136,446
Income taxes paid   1,050
Supplemental schedule of noncash investing and financing activities:    
Preferred dividends declared, not paid 54,800 $ 55,112
Conversion of preferred stock to common stock $ 8,500