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CONDENSED STATEMENTS OF CASH FLOWS (USD $)
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income (loss) $ 204,915 $ (87,750)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:    
Depreciation 158,576 135,123
Amortization 6,443 13,537
Stock based compensation 2,553 2,617
Deferred income taxes   65,000
Changes in operating assets and liabilities:    
Trade receivables (162,220) (124,341)
Inventories (333,655) (286,326)
Prepaid expenses and other assets (58,704) (27,766)
Income taxes receivable 16,400 (72,207)
Accounts payable 346,398 148,885
Accrued liabilities 87,351 59,925
Income taxes payable 85,940 (74,275)
Net cash provided by (used in) operating activities 353,997 (247,578)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchases of property, plant and equipment (123,852) (207,453)
Proceeds from sale of equipment and vehicles 7,591  
Purchases of intangibles (16,648) (35,840)
Purchases of short-term investments (350,000) (204,806)
Proceeds from maturity of short-term investments 554,807 203,483
Net cash provided by (used in) investing activities 71,898 (244,616)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from exercise of stock options 13,050 40,997
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 438,945 (451,197)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 1,704,300 967,943
CASH AND CASH EQUIVALENTS AT END OF PERIOD 2,143,245 516,746
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION    
Cash received (paid) for income taxes, net of taxes paid of $10,671 in 2013 $ (9,876) $ 2,355