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Statements of Cash Flows (Unaudited) (USD $)
 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net (loss) income $ (297,786) $ 268,098
Adjustments to reconcile net (loss) income to net cash provided by operating activities:    
Depreciation 330,796 293,116
Amortization 2,158 2,175
Deferred income taxes (146,401) 189,672
Stock-based compensation 22,265 24,261
Loss on disposal of fixed assets 4,519 36
Changes in:    
Receivables 67,846 208,051
Inventory 167,062 158,478
Prepaid expenses and other assets (185,676) 44,957
Accrued expenses 74,157 (43,486)
Accounts payable 4,835 (130,532)
Deferred revenue 6,690 0
Net cash provided by operating activities 50,465 1,014,826
CASH FLOWS FROM INVESTING ACTIVITIES :    
Purchase of property, plant and equipment (520,142) (120,136)
Maturities of short-term investments 2,489,000 2,240,000
Purchases of short-term investments (2,489,000) (2,738,000)
Purchases of long-term investments (496,000) 0
Net cash (used for) investing activities (1,016,142) (618,136)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Debt principal repayments (141,647) (135,047)
Proceeds from exercise of stock options 3,150 0
Net cash (used for) financing activities (138,497) (135,047)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS (1,104,174) 261,643
BEGINNING CASH AND CASH EQUIVALENTS 2,270,385 2,673,719
ENDING CASH AND CASH EQUIVALENTS 1,166,211 2,935,362
INCOME TAXES PAID 1,752 0
INTEREST EXPENSE PAID 44,771 51,118
NON-CASH ACTIVITIES:    
Change in capital expenditures included in accounts payable 84,031 68,100
Net change in fair value of interest rate swap $ (193) $ (24,279)