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CONDENSED STATEMENTS OF CASH FLOWS - USD ($)
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Cash flows from operating activities    
Net income $ 17,955,884 $ 322,773
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 210,683 210,369
Net unrealized (gain) loss on investments (1,103,972) 164,342
Accreted interest 32,277  
Deferred taxes (1,738,795)  
Provision for doubtful accounts 150,000 125,000
(Increase) decrease in operating assets:    
Accounts receivable (7,904,815) 1,245,531
Inventories 1,288,595 1,077,460
Other current assets (129,173) (34,566)
Other assets 12,844 20,483
Increase (decrease) in operating liabilities:    
Accounts payable (1,952,858) (572,637)
Accrued liabilities 1,433,224 (466,610)
Income taxes payable 8,333,638  
Net cash provided by operating activities 16,587,532 2,092,145
Cash flows from investing activities    
Purchase of property, plant, and equipment (12,611,028) (186,030)
Purchase of debt and equity securities (4,578,082) (41,763)
Net cash used by investing activities (17,189,110) (227,793)
Cash flows from financing activities    
Repayments of long-term debt (68,128) (64,167)
Proceeds from TIA 15,235,812  
Proceeds from the exercise of stock options 43,350  
Payment of preferred stock redemption price payable (101,250)  
Payment of preferred stock repurchase payable (1,101,110) (75,000)
Payment of preferred stock dividends (49,091) (54,800)
Net cash provided (used) by financing activities 13,959,583 (193,967)
Net increase in cash and cash equivalents 13,358,005 1,670,385
Cash and cash equivalents at:    
Beginning of period 17,566,682 5,934,749
End of period 30,924,687 7,605,134
Supplemental schedule of cash flow information:    
Interest paid 32,818 33,851
Supplemental schedule of noncash investing and financing activities:    
Preferred dividends declared, not paid 39,050 $ 54,800
Conversion of preferred stock to common stock 5,000  
Amounts receivable under TIA $ 5,477,603