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Statements of Cash Flows (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 698,257 $ 1,113,920
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation 415,821 402,027
Amortization 50,471 51,407
Stock based compensation 26,690 29,417
Gain on sale of equipment and vehicles (1,353) (13,776)
Loss on intangible asset abandonment 805 31,372
Deferred Income taxes 180,000 15,000
Changes in working capital components:    
Trade receivables (297,519) 132,370
Inventories (263,809) (127,462)
Prepaid expenses and other assets (18,958) (2,628)
Income tax refund receivable (59,322)  
Accounts payable 107,702 155,220
Accrued liabilities (38,681) (113,709)
Income taxes payable (6,572) (71,799)
Net cash provided by operating activities 793,532 1,601,369
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchases of property and equipment (621,598) (189,150)
Proceeds from sale of equipment and vehicles 10,200 22,200
Purchases of intangibles (60,470) (54,407)
Purchases of short-term investments (2,446,359) (2,621,393)
Proceeds from sale of short-term investments 2,829,346 1,205,568
Net cash used in investing activities (288,881) (1,637,182)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Repurchase of common stock (2,079) (15,130)
Proceeds from exercise of stock options 73,210 37,740
Net cash provided by financing activities 71,131 22,610
NET INCREASE (DECREASE) IN CASH 575,782 (13,203)
CASH AT BEGINNING OF YEAR 1,291,383 1,304,586
CASH AT END OF YEAR 1,867,165 1,291,383
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION    
Cash paid for income taxes, net of refunds received of $4090 and $81,422, respectively 230,894 531,799
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]    
Equipment transferred from inventory to property, plant and equipment $ 227,039