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Statements of Cash Flows (Unaudited) - USD ($)
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income (loss) $ 573,140 $ (308,116)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation 243,783 227,299
Amortization 1,438 1,438
Deferred income taxes 431,667 (167,130)
Stock-based compensation 11,483 17,291
(Gain) loss on disposal of fixed assets (7,976) 4,517
Changes in:    
Receivables 270,326 202,984
Inventory 299,643 262,312
Prepaid expenses and other assets (141,738) (91,643)
Accounts payable and accrued expenses (157,075) 180,921
Deferred revenue (6,690) 0
Net cash provided by operating activities 1,518,001 329,873
CASH FLOWS FROM INVESTING ACTIVITIES :    
Purchase of property, plant and equipment (1,434,200) (312,657)
Maturities of investments 2,241,000 2,241,000
Purchases of investments (1,240,000) (2,737,000)
Proceeds from sale of fixed assets 29,215 0
Net cash (used for) investing activities (403,985) (808,657)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Debt principal repayments (98,485) (93,898)
Proceeds from exercise of stock options 45,140 3,150
Tax benefits related to stock options 14,480 0
Net cash (used for) financing activities (38,865) (90,748)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 1,075,151 (569,532)
BEGINNING CASH AND CASH EQUIVALENTS 850,028 2,270,385
ENDING CASH AND CASH EQUIVALENTS 1,925,179 1,700,853
INCOME TAXES PAID 2,800 1,752
INTEREST EXPENSE PAID 26,320 30,116
NON-CASH ACTIVITIES:    
Change in capital expenditures included in accounts payable and accrued expenses (190,771) (19,208)
Net change in fair value of interest rate swap $ (1,088) $ 4,824