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CONDENSED STATEMENTS OF CASH FLOWS - USD ($)
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Cash flows from operating activities    
Net income (loss) $ 322,773 $ (129,221)
Adjustments to reconcile net income (loss) to net cash provided (used) by operating activities:    
Depreciation and amortization 210,369 211,754
Net unrealized gains on investments 164,342 (43,102)
Provision for doubtful accounts 125,000  
(Increase) decrease in operating assets:    
Accounts receivable 1,245,531 263,928
Inventories 1,077,460 130,992
Other current assets (34,566) (73,290)
Other assets 20,483  
Decrease in operating liabilities    
Accounts payable (572,637) (522,320)
Accrued liabilities (466,610) (554,745)
Net cash provided (used) by operating activities 2,092,145 (716,004)
Cash flows from investing activities    
Purchase of property, plant, and equipment (186,030) (29,485)
Purchase of debt and equity securities (41,763) (4,515,612)
Net cash used by investing activities (227,793) (4,545,097)
Cash flows from financing activities    
Repayments of long-term debt (64,167) (102,454)
Repurchase of preferred stock (75,000)  
Payment of preferred stock dividends (54,800) (55,113)
Net cash used by financing activities (193,967) (157,567)
Net increase (decrease) in cash and cash equivalents 1,670,385 (5,418,668)
Cash and cash equivalents at:    
Beginning of period 5,934,749 9,647,292
End of period 7,605,134 4,228,624
Supplemental schedule of cash flow information:    
Interest paid 33,851 45,875
Supplemental schedule of noncash investing and financing activities:    
Preferred dividends declared, not paid $ 54,800 $ 55,113