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Statements of Cash Flows (Unaudited) - USD ($)
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 452,448 $ 479,082
Adjustments to reconcile net income to net cash (used for) provided by operating activities:    
Depreciation 162,547 115,664
Amortization 10,617 720
Deferred income taxes 222,004 332,718
Stock-based compensation $ 8,908 4,478
(Gain) on disposal of fixed assets (5,306)
Changes in:    
Receivables $ (701,755) 250,438
Inventory 2,305 367,092
Prepaid expenses and other assets (77,203) (30,222)
Accounts payable and accrued expenses (167,112) (112,903)
Net cash (used for) provided by operating activities (87,241) 1,401,761
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of property, plant and equipment (311,480) (988,459)
Purchase of certain business assets (368,219) 0
Maturities of investments 496,000 1,245,000
Purchases of investments (1,984,000) 0
Proceeds from sale of fixed assets 0 5,565
Net cash (used for) provided by investing activities (2,167,699) 262,106
CASH FLOWS FROM FINANCING ACTIVITIES:    
Debt principal repayments (33,414) (49,057)
Debt issuance costs (36,893) 0
Proceeds from exercise of stock options 0 5,250
Proceeds from public offering 5,900,002 0
Payments for public offering costs (586,779) 0
Net cash provided by (used for) financing activities 5,242,916 (43,807)
NET INCREASE IN CASH AND CASH EQUIVALENTS 2,987,976 1,620,060
BEGINNING CASH AND CASH EQUIVALENTS 1,573,328 850,028
ENDING CASH AND CASH EQUIVALENTS 4,561,304 2,470,088
INCOME TAXES PAID 1,125 2,800
INTEREST EXPENSE PAID 38,713 13,050
NON-CASH ACTIVITIES:    
Change in capital expenditures included in accounts payable and accrued expenses 100,678 (151,588)
Net change in fair value of interest rate swaps $ 65,074 $ 3,906