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Statements of Cash Flows (USD $)
 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net (loss) income $ (308,116) $ 210,761
Adjustments to reconcile net (loss) income to net cash provided by operating activities:    
Depreciation 227,299 196,000
Amortization 1,438 1,438
Deferred income taxes (167,130) 170,406
Stock-based compensation 17,291 16,321
Loss on disposal of fixed assets 4,517 37
Changes in:    
Receivables 202,984 53,672
Inventory 262,312 76,228
Prepaid expenses and other assets (91,643) (16,903)
Accounts payable 15,382 (52,715)
Accrued expenses 165,539 30,208
Deferred revenue    250,000
Net cash provided by operating activities 329,873 935,453
CASH FLOWS FROM INVESTING ACTIVITES :    
Purchase of property, plant and equipment (312,657) (83,410)
Maturities of short-term investments 2,241,000 1,494,000
Purchases of short-term investments (2,241,000) (2,490,000)
Purchases of long-term investments (496,000)   
Net cash used for investing activities (808,657) (1,079,410)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Debt principal repayments (93,898) (89,535)
Proceeds from exercise of stock options 3,150   
Net cash used for financing activities (90,748) (89,535)
NET DECREASE IN CASH AND CASH EQUIVALENTS (569,532) (233,492)
BEGINNING CASH AND CASH EQUIVALENTS 2,270,385 2,673,719
ENDING CASH AND CASH EQUIVALENTS 1,700,853 2,440,227
INCOME TAXES PAID 1,752   
INTEREST EXPENSE PAID 30,116 34,495
NON-CASH ACTIVITIES:    
Change in capital expenditures included in accounts payable (19,208) (4,550)
Net change in fair value of interest rate swap $ 4,824 $ (24,225)