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STATEMENTS OF CASH FLOWS - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Cash flows from operating activities      
Net income (loss) $ 3,148,234 $ (1,339,943) $ (3,736,038)
Adjustments to reconcile net income (loss) to net cash provided (used) by operating activities:      
Depreciation and amortization 852,080 886,814 834,951
Realized gains on investments (7,925)    
Net unrealized gains on investments (129,315)    
Share-based Compensation     672,223
Inventories reserve   (297,731)  
Provision for doubtful accounts   47,793 24,272
(Increase) decrease in assets:      
Accounts receivable (1,652,015) 145,407 (1,861,990)
Inventories 94,502 (1,041,202) 811,063
Other current assets 9,602 (226,649) (225,606)
Income taxes receivable 100,937 (13,266) (188,456)
Other assets 77,541    
Increase (decrease) in liabilities:      
Accounts payable (362,072) 411,927 485,994
Other accrued liabilities 55,150 699,030 (205,342)
Insurance proceeds   (466,293) 466,293
Income taxes payable 7,919 (1,382)  
Net cash provided (used) by operating activities 2,194,638 (1,195,495) (2,922,636)
Cash flows from investing activities:      
Purchase of property, plant, and equipment (632,078) (382,156) (91,878)
Purchase of debt and equity securities (7,360,398) (2,986,156)  
Proceeds from the sales of debt and equity securities 2,712,134    
Net cash used by investing activities (5,280,342) (3,368,312) (91,878)
Cash flows from financing activities      
Repayments of long-term debt (407,014) (446,350) (436,280)
Proceeds from sale of common stock     2,350,100
Payment of preferred stock dividends (219,825) (220,450) (220,450)
Net cash used by financing activities (626,839) (666,800) 1,693,370
Net decrease in cash and cash equivalents (3,712,543) (5,230,607) (1,321,144)
Cash and cash equivalents at:      
Beginning of period 9,647,292 14,877,899 16,199,043
End of period 5,934,749 9,647,292 14,877,899
Supplemental schedule of cash flow information:      
Interest paid 166,897 177,190 210,761
Income taxes paid   1,173 1,031
Supplemental schedule of noncash investing and financing activities:      
Preferred dividends declared, not paid 54,800 $ 55,113 $ 55,113
Conversion of preferred stock to common stock $ 8,500