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STATEMENTS OF CASH FLOWS (USD $)
 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income (loss) $ 106,375 $ (408,980)
Adjustments to reconcile net income (loss) to net cash provided by (used for) operating activities:    
Depreciation 304,511 306,531
Amortization 2,156 4,521
Deferred income taxes 89,245 (304,177)
Stock-based compensation 27,480 28,034
Loss on disposal of fixed assets 288 9,582
Changes in:    
Receivables (83,290) 48,513
Inventory (133,305) (155,785)
Prepaid expenses and other assets (66,403) 140,260
Accrued expenses (98,618) (40,654)
Accounts payable 41,138 31,746
Deferred revenue (8,250) 8,250
Net cash provided by (used for) operating activities 181,327 (332,159)
CASH FLOWS FROM INVESTING ACTIVITES :    
Purchase of property, plant and equipment (249,571) (187,934)
Maturities of short-term investments 3,183,000 2,229,000
Purchases of short-term investments (2,240,000) (3,183,000)
Net cash provided by (used for) investing activities 693,429 (1,141,934)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from debt issuance 0 600,000
Debt principal repayments (128,610) (103,086)
Proceeds from exercise of stock options 50,800 128,170
Tax benefits related to stock options 6,842 13,568
Net cash (used for) provided by financing activities (70,968) 638,652
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 803,788 (835,441)
BEGINNING CASH AND CASH EQUIVALENTS 781,516 1,398,985
ENDING CASH AND CASH EQUIVALENTS 1,585,304 563,544
INTEREST PAID (57,637) (58,650)
INCOME TAXES PAID (605) (209)
NON-CASH ACTIVITIES:    
Change in capital expenditures included in accounts payable (25,762) (41,072)
Net change in fair value of interest rate swap $ 12,521 $ 48,795