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CONDENSED STATEMENTS OF CASH FLOWS - USD ($)
 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Cash flows from operating activities    
Net income $ 4,088,886 $ 262,531
Adjustments to reconcile net income to net cash provided (used) by operating activities:    
Depreciation and amortization 419,488 427,018
Net unrealized gain on investments (870,760) (102,128)
Realized gains on investments   (7,924)
Allowance for doubtful accounts 125,000  
Deferred tax asset (1,801,996)  
(Increase) decrease in operating assets:    
Accounts receivable (2,021,098) (1,244,224)
Inventories (1,945,014) 478,511
Other current assets 10,917 (37,188)
Other assets 41,049 41,036
Increase (decrease) in operating liabilities:    
Accounts payable 2,182,838 (316,145)
Accrued liabilities (87,702) (324,776)
Income taxes payable 69,989 3,525
Net cash provided (used) by operating activities 211,597 (819,764)
Cash flows from investing activities    
Purchase of property, plant, and equipment (374,128) (345,784)
Purchase of debt and equity securities (2,118,410) (6,755,714)
Proceeds from the sales of investments   2,362,134
Net cash used by investing activities (2,492,538) (4,739,364)
Cash flows from financing activities    
Proceeds of long-term debt 1,363,000  
Repayments of long-term debt (128,797) (207,070)
Repurchase of preferred stock (100,000)  
Proceeds from the exercise of stock options 626,687  
Payment of preferred stock dividends (109,600) (110,226)
Net cash provided (used) by financing activities 1,651,290 (317,296)
Net decrease in cash and cash equivalents (629,651) (5,876,424)
Cash and cash equivalents at:    
Beginning of period 5,934,749 9,647,292
End of period 5,305,098 3,770,868
Supplemental schedule of cash flow information:    
Interest paid 103,687 89,384
Supplemental schedule of noncash investing and financing activities:    
Preferred dividends declared, not paid $ 54,800 54,800
Conversion of preferred stock to common stock   $ 8,500