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CONDENSED STATEMENTS OF CASH FLOWS - USD ($)
 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Cash flows from operating activities    
Net income $ 12,714,637 $ 1,286,965
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 624,998 641,224
Net unrealized gain on investments (559,543) (129,728)
Realized gains on investments (162,595) (7,925)
Allowance for doubtful accounts 125,000 0
Deferred taxes (804,357) 0
(Increase) decrease in operating assets:    
Accounts receivable (7,542,375) (1,384,383)
Inventories (301,951) 798,980
Other current assets (18,053) (50,677)
Other assets 10,125 56,661
Increase (decrease) in operating liabilities:    
Accounts payable 2,272,302 317,084
Accrued liabilities 1,803,433 (54,904)
Income taxes payable 670,531 7,919
Net cash provided (used) by operating activities 8,832,152 1,481,216
Cash flows from investing activities    
Purchase of property, plant, and equipment (9,478,182) (487,256)
Purchase of debt and equity securities (2,174,980) (6,969,552)
Proceeds from the sales of investments 3,965,329 2,362,134
Net cash used by investing activities (7,687,833) (5,094,674)
Cash flows from financing activities    
Proceeds of long-term debt 1,363,000 0
Repayments of long-term debt (194,985) (313,949)
Proceeds from TIA 6,883,103 0
Repurchase of preferred stock (100,000) 0
Proceeds from the exercise of stock options 851,012 0
Payment of preferred stock dividends (164,400) (165,026)
Net cash provided (used) by financing activities 8,637,730 (478,975)
Net increase (decrease) in cash and cash equivalents 9,782,049 (4,092,433)
Cash and cash equivalents at:    
Beginning of period 5,934,749 9,647,292
End of period 15,716,798 5,554,859
Supplemental schedule of cash flow information:    
Interest paid 105,959 130,085
Supplemental schedule of noncash investing and financing activities:    
Preferred dividends declared, not paid 52,242 54,800
Conversion of preferred stock to common stock 15,000 8,500
Preferred stock repurchase payable $ 2,723,248 $ 0