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CONDENSED STATEMENTS OF CASH FLOWS - USD ($)
 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Cash flows from operating activities    
Net income (loss) $ 5,239,459 $ (3,056,790)
Adjustments to reconcile net income (loss) to net cash used by operating activities:    
Provision for doubtful accounts 141,000  
Depreciation and amortization 645,038 835,163
(Increase) decrease in assets:    
Inventories (1,447,486) 868,864
Accounts receivable 474,048 (2,672,064)
Other current assets 419,238 460,769
Increase (decrease) in liabilities:    
Accounts payable (36,989) 912,974
Litigation proceeds subject to stipulation (7,724,826)  
Other accrued liabilities 321,124 (1,099,026)
Income taxes payable (2,885) (85,233)
Net cash used by operating activities (1,972,279) (3,835,343)
Cash flows from investing activities    
Purchase of property, plant, and equipment (1,263,296) (970,170)
Changes in restricted cash 600,897 (600,594)
Net cash used by investing activities (662,399) (1,570,764)
Cash flows from financing activities    
Repayments of long-term debt and notes payable (123,602) (200,236)
Proceeds from the exercise of stock options 283,933 223,680
Proceeds from long-term debt 276,495  
Payment of Preferred Stock dividends (227,180) (172,839)
Net cash provided (used) by financing activities 209,646 (149,395)
Net decrease in cash and cash equivalents (2,425,032) (5,555,502)
Cash and cash equivalents at:    
Beginning of period 22,128,977 27,629,359
End of period 19,703,945 22,073,857
Supplemental schedule of cash flow information:    
Interest paid 165,269 168,388
Income taxes paid 9,017 $ 94,029
Supplemental schedule of noncash investing and financing activities:    
Preferred dividends declared, not paid $ 56,363