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STATEMENTS OF CASH FLOWS (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
CASH FLOWS FROM OPERATING ACTIVITIES:      
Net income (loss) $ 89,512 $ (409,510) $ (384,684)
Adjustments to reconcile net income (loss) to net cash provided by (used for) operating activities:      
Depreciation 399,640 413,132 416,918
Amortization 2,876 5,240 2,593
Deferred income taxes 94,370 (302,500) (299,171)
Stock-based compensation 35,985 38,172 29,513
Loss on disposal of fixed assets 12,265 10,822 575
Changes in:      
Receivables (227,858) 113,417 (82,301)
Income taxes receivable/payable 300 300 300
Inventory 17,463 (65,449) (513,625)
Prepaid expenses and other assets (123,628) 159,484 (60,913)
Accounts payable 100,047 59,479 (26,811)
Accrued expenses (48,332) (68,152) 108,993
Deferred revenue (8,250) 8,250 0
Net cash provided by (used for) operating activities 344,390 (37,315) (808,613)
CASH FLOWS FROM INVESTING ACTIVITIES:      
Purchase of property, plant and equipment (275,395) (243,735) (116,547)
Maturities of short-term investments 4,178,000 3,227,000 4,108,000
Purchases of short-term investments (2,240,000) (4,178,000) (3,725,000)
Net cash provided by (used for) investing activities 1,662,605 (1,194,735) 266,453
CASH FLOWS FROM FINANCING ACTIVITIES:      
Proceeds from debt issuance 0 600,000 1,000,000
Debt principal repayments (172,853) (145,232) (13,856)
Debt issuance costs 0 0 (26,489)
Proceeds from exercise of stock options 50,800 145,295 6,000
Tax benefits related to stock options 7,261 14,518 0
Net cash (used for) provided by financing activities (114,792) 614,581 965,655
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 1,892,203 (617,469) 423,495
BEGINNING CASH AND CASH EQUIVALENTS 781,516 1,398,985 975,490
ENDING CASH AND CASH EQUIVALENTS 2,673,719 781,516 1,398,985
INCOME TAXES PAID (708) (510) (144)
INTEREST EXPENSE PAID (75,681) (78,737) (20,000)
NON-CASH ACTIVITIES:      
Change in capital expenditures included in accounts payable and accrued expenses (21,212) (15,341) 32,839
Net change in fair value of interest rate swap $ 9,308 $ 50,443 $ (9,631)