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Unaudited Condensed Statements of Cash Flows - USD ($)
 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 443,292 $ 573,140
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation 368,358 243,783
Amortization 19,285 1,438
Deferred income taxes 217,825 431,667
Stock-based compensation 28,952 11,483
(Gain) on disposal of fixed assets 0 (7,976)
Changes in:    
Accounts receivable (229,190) 272,072
Inventory (245,671) 299,643
Prepaid expenses and other current assets (246,395) (143,484)
Accounts payable and accrued expenses (190,399) (157,075)
Deferred revenue 0 (6,690)
Net cash provided by operating activities 166,057 1,518,001
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of property, plant and equipment (691,278) (1,434,200)
Acquisition of certain business assets (368,219) 0
Maturities of investments 1,984,000 2,241,000
Purchases of investments (4,216,000) (1,240,000)
Proceeds from sale of fixed assets 0 29,215
Net cash used for investing activities (3,291,497) (403,985)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Debt principal repayments (66,828) (98,485)
Debt issuance costs (46,734) 0
Proceeds from exercise of stock options 3,150 45,140
Tax benefits related to stock options 0 14,480
Proceeds from public offering, net 5,313,223 0
Net cash provided by (used for) financing activities 5,202,811 (38,865)
NET INCREASE IN CASH AND CASH EQUIVALENTS 2,077,371 1,075,151
BEGINNING CASH AND CASH EQUIVALENTS 1,573,328 850,028
ENDING CASH AND CASH EQUIVALENTS 3,650,699 1,925,179
CASH PAID FOR:    
Income taxes 125,125 2,800
Interest expense 77,415 26,320
NON-CASH ACTIVITIES:    
Change in capital expenditures included in accounts payable and accrued expenses 328,222 (190,771)
Net change in fair value of interest rate swaps $ 95,290 $ (1,088)