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CONDENSED STATEMENTS OF CASH FLOWS (USD $)
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Cash flows from operating activities    
Net loss $ (1,409,533) $ (714,429)
Adjustments to reconcile net loss to net cash provided by (used by) operating activities:    
Depreciation and amortization 314,179 329,419
Provisions for doubtful accounts   24,046
Provision for inventory valuation   30,000
Gain (loss) on disposal of assets (1,000)  
Accreted interest   2,187
(Increase) decrease in assets:    
Inventories (201,770) 702,626
Accounts receivable 536,846 (290,017)
Income taxes receivable   (34,205)
Other current assets 483,634 (60,127)
Increase (decrease) in liabilities:    
Accounts payable (1,836,871) (764,316)
Other accrued liabilities (17,770) 935,719
Income taxes payable 1,876 (14,705)
Net cash provided by (used by) operating activities (2,130,409) 146,198
Cash flows from investing activities    
Purchase of property, plant, and equipment (63,890) (52,899)
Proceeds from sale of assets 1,000  
Net cash used by investing activities (62,890) (52,899)
Cash flows from financing activities    
Repayments of long-term debt and notes payable (77,657) (180,382)
Repurchase of Common Stock (101,672)  
Payment of Preferred Stock dividends (57,613)  
Net cash used by financing activities (236,942) (180,382)
Net decrease in cash and cash equivalents (2,430,241) (87,083)
Cash and cash equivalents at:    
Beginning of period 25,963,313 25,673,263
End of period 23,533,072 25,586,180
Supplemental schedule of cash flow information:    
Interest paid 62,537 69,906
Income taxes paid   59,030
Supplemental schedule of noncash investing and financing activities:    
Preferred dividends declared, not paid $ 57,613