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STATEMENTS OF CASH FLOWS (USD $)
 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income (loss) $ 169,949 $ (281,331)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation 210,275 210,920
Amortization 1,438 3,372
Deferred income taxes 120,589 (216,211)
Stock-based compensation 18,017 17,736
Loss on disposal of fixed assets 287 9,582
Changes in:    
Receivables (6,268) (22,244)
Inventory 191 (37,779)
Prepaid expenses and other assets (99,114) 74,427
Accrued expenses (74,380) 280,830
Accounts payable (13,921) (21,773)
Deferred revenue (8,250) 8,250
Net cash provided by operating activities 318,813 25,779
CASH FLOWS FROM INVESTING ACTIVITES :    
Purchase of property, plant and equipment (236,953) (152,544)
Maturities of short-term investments 1,692,000 735,000
Purchases of short-term investments (1,494,000) (1,692,000)
Net cash used for investing activities (38,953) (1,109,544)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from debt issuance 0 600,000
Debt principal repayments (85,250) (61,747)
Proceeds from exercise of stock options 50,800 30,370
Tax benefits related to stock options 6,842 7,404
Net cash (used for) provided by financing activities (27,608) 576,027
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 252,252 (507,738)
BEGINNING CASH AND CASH EQUIVALENTS 781,516 1,398,985
ENDING CASH AND CASH EQUIVALENTS 1,033,768 891,247
INTEREST EXPENSE PAID (38,871) (37,841)
INCOME TAXES PAID (378) (153)
NON-CASH ACTIVITIES:    
Change in capital expenditures included in accounts payable (23,506) (25,482)
Net change in fair value of interest rate swap $ 8,220 $ 11,943