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CONDENSED STATEMENTS OF CASH FLOWS - USD ($)
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Cash flows from operating activities:    
Net income (loss) $ 4,898,285 $ (3,428,215)
Adjustments to reconcile net income (loss) to net cash used by operating activities:    
Provision for doubtful accounts 125,000  
Depreciation and amortization 433,894 595,172
(Increase) decrease in assets:    
Inventories (841,216) 384,187
Accounts receivable 1,696,410 (606,471)
Other current assets 165,234 481,439
Increase (decrease) in liabilities:    
Accounts payable (835,299) (300,843)
Litigation proceeds subject to stipulation (7,724,826)  
Other accrued liabilities 341,033 (773,732)
Income taxes payable 2,107 (84,290)
Net cash used by operating activities (1,739,378) (3,732,753)
Cash flows from investing activities:    
Purchase of property, plant, and equipment (693,211) (962,279)
Changes in restricted cash (595) (600,000)
Net cash used by investing activities (693,806) (1,562,279)
Cash flows from financing activities:    
Repayments of long-term debt and notes payable (74,795) (145,754)
Proceeds from the exercise of stock options 264,953 175,081
Payment of Preferred Stock dividends (170,817) (115,226)
Net cash provided (used) by financing activities 19,341 (85,899)
Net decrease in cash and cash equivalents (2,413,843) (5,380,931)
Cash and cash equivalents at:    
Beginning of period 22,128,977 27,629,359
End of period 19,715,134 22,248,428
Supplemental schedule of cash flow information:    
Interest paid 106,953 113,203
Income taxes paid 1,981 91,210
Supplemental schedule of noncash investing and financing activities:    
Preferred dividends declared, not paid $ 56,363 $ 57,613