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CONDENSED STATEMENTS OF CASH FLOWS (USD $)
 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Cash flows from operating activities    
Net income (loss) $ (1,592,020) $ 4,399,273
Adjustments to reconcile net income (loss) to net cash provided by (used by) operating activities:    
Depreciation and amortization 986,761 987,161
Provision for doubtful accounts 30,854 429,815
Provision for inventory valuation 90,000 52,835
Reserve for non-contractual deductions   471,072
Accreted interest 3,773 14,518
(Increase) decrease in assets:    
Inventories 1,201,385 981,766
Accounts receivable (1,675,218) 868,033
Income taxes receivable (39,849) (4,431)
Other current assets (454,412) 560,141
Increase (decrease) in liabilities:    
Accounts payable (761,912) (918,429)
Accrued liabilities, other 1,009,720 (2,740,123)
Income taxes payable (1,174) (106,254)
Net cash provided by (used by) operating activities (1,202,092) 4,995,377
Cash flows from investing activities    
Purchase of property, plant, and equipment (282,560) (653,873)
Net cash used by investing activities (282,560) (653,873)
Cash flows from financing activities    
Repayments of long-term debt and notes payable (543,293) (444,552)
Proceeds from the exercise of stock options 1,620,000 44,001
Repurchase of Common Stock (83,792)  
Payment of Preferred Stock dividends (172,838) (291,700)
Net cash used by financing activities 820,077 (692,251)
Net increase (decrease) in cash and cash equivalents (664,575) 3,649,253
Cash and cash equivalents at:    
Beginning of period 25,673,263 23,266,039
End of period 25,008,688 26,915,292
Supplemental disclosures of cash flow information:    
Interest paid 207,571 210,307
Income taxes paid 71,328 134,057
Supplemental disclosure of noncash investing and financing activities:    
Preferred dividends declared 57,613 72,925
Debt assumed for the purchase of molding machines   $ 327,725