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STATEMENTS OF CASH FLOWS (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
CASH FLOWS FROM OPERATING ACTIVITIES:      
Net income (loss) $ (409,510) $ (384,684) $ (216,493)
Adjustments to reconcile net income (loss) to net cash used for operating activities:      
Depreciation 413,132 416,918 394,295
Amortization 5,240 2,593 30,145
Deferred income taxes (302,500) (299,171) (213,348)
Stock-based compensation 38,172 29,513 94,062
Loss on disposal of fixed assets 10,822 575 29,860
Changes in:      
Receivables 113,417 (82,301) 117,866
Income taxes receivable/payable 300 300 361,226
Inventory (65,449) (513,625) (490,987)
Prepaid expenses and other assets 159,484 (60,913) (86,306)
Accounts payable 59,479 (26,811) 29,985
Accrued expenses (68,152) 108,993 (159,970)
Deferred revenue 8,250 0 0
Net cash used for operating activities (37,315) (808,613) (109,665)
CASH FLOWS FROM INVESTING ACTIVITIES:      
Purchase of property, plant and equipment (243,735) (116,547) (459,548)
Maturities of short-term investments 3,227,000 4,108,000 3,854,103
Purchases of short-term investments (4,178,000) (3,725,000) (3,610,000)
Net cash (used for) provided by investing activities (1,194,735) 266,453 (215,445)
CASH FLOWS FROM FINANCING ACTIVITIES:      
Proceeds from debt issuance 600,000 1,000,000 0
Debt principal repayments (145,232) (13,856) 0
Debt issuance costs 0 (26,489) 0
Tax benefits related to stock options 14,518 0 921
Proceeds from exercise of stock options 145,295 6,000 99,750
Net cash provided by financing activities 614,581 965,655 100,671
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS (617,469) 423,495 (224,439)
BEGINNING CASH AND CASH EQUIVALENTS 1,398,985 975,490 1,199,929
ENDING CASH AND CASH EQUIVALENTS 781,516 1,398,985 975,490
INCOME TAXES (PAID) REFUNDED, NET (510) (144) 360,777
INTEREST EXPENSE PAID (78,737) (20,000) 0
NON-CASH ACTIVITIES:      
Change in capital expenditures included in accounts payable and accrued expenses (15,341) 32,839 8,263
Net change in fair value of interest rate swap $ 50,443 $ (9,631) $ 0