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STATEMENTS OF CASH FLOWS - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Cash flows from operating activities      
Net income (loss) $ 4,314,318 $ (2,354,605) $ (6,213,852)
Adjustments to reconcile net income (loss) to net cash used by operating activities:      
Depreciation and amortization 858,391 1,074,520 1,284,249
Share based compensation     52,775
Provision for doubtful accounts 116,395 27,300 50,000
Provision for inventory valuation     530,000
Gain on disposal of assets     (1,000)
(Increase) decrease in assets:      
Inventories (1,633,077) 1,072,041 (1,275,336)
Accounts receivable 624,699 (2,192,673) 167,589
Income taxes receivable     9,431
Other current assets (373,977) (128,414) (281,881)
Increase (decrease) in liabilities:      
Accounts payable 554,722 35,018 7,895
Litigation proceeds subject to stipulation (7,724,826)   7,724,826
Other accrued liabilities 11,312 (1,318,327) 787,902
Income taxes payable (114) (82,682) 90,971
Net cash (provided) used by operating activities (3,252,157) (3,867,822) 2,933,569
Cash flows from investing activities      
Purchase of property, plant, and equipment (1,465,010) (1,007,933) (283,289)
Changes in restricted cash 600,897 (600,897)  
Proceeds from sale of assets     1,000
Net cash used by investing activities (864,113) (1,608,830) (282,289)
Cash flows from financing activities      
Repayments of long-term debt and notes payable (184,447) (249,220) (317,303)
Proceeds from long-term debt 276,495    
Proceeds from the exercise of stock options 283,933 398,328 536,925
Repurchase of Common Stock     (974,407)
Stock registration fees (60,101)    
Payment of Preferred Stock dividends (283,543) (172,838) (230,449)
Net cash provided (used) by financing activities 32,337 (23,730) (985,234)
Net increase (decrease) in cash and cash equivalents. (4,083,933) (5,500,382) 1,666,046
Cash and cash equivalents at:      
Beginning of period 22,128,977 27,629,359 25,963,313
End of period 18,045,044 22,128,977 27,629,359
Supplemental schedule of cash flow information:      
Interest paid 219,672 222,808 241,052
Income taxes paid 3,700 $ 94,332 7,988
Supplemental schedule of noncash investing and financing activities:      
Preferred dividends declared, not paid $ 55,414   $ 57,613