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CONDENSED STATEMENTS OF CASH FLOWS (USD $)
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Cash flows from operating activities    
Net income (loss) $ (714,429) $ 1,723,957
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation and amortization 329,419 327,577
Provisions for doubtful accounts 24,046 167,000
Provision for inventory valuation 30,000 52,835
Accreted interest 2,187 5,695
(Increase) decrease in assets:    
Inventories 702,626 1,633,688
Accounts receivable (290,017) (195,980)
Income taxes receivable (34,205)  
Other current assets (60,127) 431,637
Increase (decrease) in liabilities:    
Accounts payable (764,316) (705,560)
Other accrued liabilities 935,719 (1,701,383)
Income taxes payable (14,705) (94,818)
Net cash provided by operating activities 146,198 1,644,648
Cash flows from investing activities    
Purchase of property, plant, and equipment (52,899) (200,042)
Net cash used by investing activities (52,899) (200,042)
Cash flows from financing activities    
Repayments of long-term debt and notes payable (180,382) (132,548)
Proceeds from the exercise of stock options   21,708
Net cash used by financing activities (180,382) (110,840)
Net increase (decrease) in cash and cash equivalents (87,083) 1,333,766
Cash and cash equivalents at:    
Beginning of period 25,673,263 23,266,039
End of period 25,586,180 24,599,805
Supplemental disclosures of cash flow information:    
Interest paid 69,906 69,229
Income taxes paid $ 59,030 $ 130,000