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Statements of Cash Flows (Unaudited) - USD ($)
 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income (loss) $ 924,432 $ (297,786)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation 378,475 330,796
Amortization 2,074 2,158
Deferred income taxes 680,087 (146,401)
Stock-based compensation 17,825 22,265
(Gain) loss on disposal of fixed assets (3,984) 4,519
Changes in:    
Receivables 216,078 67,846
Inventory 81,311 167,062
Prepaid expenses and other assets (127,160) (185,676)
Accounts payable and accrued expenses (92,332) 78,992
Deferred revenue (6,690) 6,690
Net cash provided by operating activities 2,070,116 50,465
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of property, plant and equipment (1,772,091) (520,142)
Maturities of investments 2,489,000 2,489,000
Purchases of investments (3,711,000) (2,985,000)
Proceeds from sale of fixed assets 66,215 0
Net cash (used for) investing activities (2,927,876) (1,016,142)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from debt issuance 2,500,000 0
Debt principal repayments (136,339) (141,647)
Debt issuance costs (32,759) 0
Proceeds from exercise of stock options 120,210 3,150
Tax benefits related to stock options 25,707  
Net cash provided by (used for) financing activities 2,476,819 (138,497)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 1,619,059 (1,104,174)
BEGINNING CASH AND CASH EQUIVALENTS 850,028 2,270,385
ENDING CASH AND CASH EQUIVALENTS 2,469,087 1,166,211
INCOME TAXES PAID 3,600 1,752
INTEREST EXPENSE PAID 38,324 44,771
NON-CASH ACTIVITIES:    
Change in capital expenditures included in accounts payable and accrued expenses (213,418) 84,031
Net change in fair value of interest rate swaps $ 48,059 $ (193)