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CONDENSED STATEMENTS OF CASH FLOWS (USD $)
 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Cash flows from operating activities    
Net income (loss) $ (1,319,059) $ 2,570,829
Adjustments to reconcile net income (loss) to net cash provided by (used by) operating activities:    
Depreciation and amortization 666,071 654,666
Provisions for doubtful accounts 29,211 854,959
Provision for inventory valuation 60,000 52,835
Accreted interest 3,449 10,540
(Increase) decrease in assets:    
Inventories 1,161,036 545,101
Accounts receivable (3,193,509) 2,438,644
Income taxes receivable (30,393) 58
Other current assets 32,229 466,754
Increase (decrease) in liabilities:    
Accounts payable (666,418) (546,369)
Other accrued liabilities 1,017,193 (2,735,373)
Income taxes payable (10,776) (77,534)
Net cash provided by (used by) operating activities (2,250,966) 4,235,110
Cash flows from investing activities    
Purchase of property, plant, and equipment (156,879) (464,689)
Net cash used by investing activities (156,879) (464,689)
Cash flows from financing activities    
Repayments of long-term debt and notes payable (361,683) (283,431)
Proceeds from the exercise of stock options   37,278
Net cash used by financing activities (361,683) (246,153)
Net increase (decrease) in cash and cash equivalents (2,769,528) 3,524,268
Cash and cash equivalents at:    
Beginning of period 25,673,263 23,266,039
End of period 22,903,735 26,790,307
Supplemental disclosures of cash flow information:    
Interest paid 138,901 139,933
Income taxes paid 69,399 130,000
Supplemental schedule of noncash financing activities:    
Preferred dividends declared   291,700
Debt assumed for the purchase of molding machines   $ 327,725