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CONDENSED STATEMENTS OF CASH FLOWS - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash flows from operating activities      
Net income (loss) $ (3,736,038) $ (3,694,907) $ 4,314,318
Adjustments to reconcile net income (loss) to net cash provided (used) by operating activities:      
Depreciation and amortization 834,951 872,868 858,391
Share-based compensation 672,223 387,726  
Inventories reserve   176,424  
Provision for doubtful accounts 24,272 92,000 116,395
Impairment of assets   456,119  
(Increase) decrease in assets:      
Inventories 811,063 (897,023) (1,633,077)
Accounts receivable (1,861,990) 1,541,159 624,699
Other current assets (225,606) 1,375,484 (373,977)
Income taxes receivable (188,456)    
Other assets   (750)  
Increase (decrease) in liabilities:      
Accounts payable 485,994 (1,225,762) 554,722
Litigation proceeds subject to stipulation     (7,724,826)
Other accrued liabilities (205,342) 119,342 11,312
Income taxes payable   2,408 (114)
Insurance proceeds 466,293    
Net cash used by operating activities (2,922,636) (794,912) (3,252,157)
Cash flows from investing activities      
Purchase of property, plant, and equipment (91,878) (1,947,172) (1,465,010)
Changes in restricted cash     600,897
Net cash used by investing activities (91,878) (1,947,172) (864,113)
Cash flows from financing activities      
Repayments of long-term debt (436,280) (263,200) (184,447)
Proceeds from long-term debt   525,017 276,495
Proceeds from sale of common stock 2,350,100    
Proceeds from the exercise of stock options   855,021 283,933
Stock registration fees     (60,101)
Payment of Preferred Stock dividends (220,450) (220,755) (283,543)
Net cash provided by financing activities 1,693,370 896,083 32,337
Net decrease in cash and cash equivalents (1,321,144) (1,846,001) (4,083,933)
Cash and cash equivalents at:      
Beginning of period 16,199,043 18,045,044 18,045,044
End of period 14,877,899 16,199,043 18,045,044
Supplemental schedule of cash flow information:      
Interest paid 210,761 213,295 219,672
Income taxes paid 1,031 2,000 3,700
Supplemental schedule of noncash investing and financing activities:      
Preferred dividends declared, not paid $ 55,113 $ 55,113 $ 55,414