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Unaudited Condensed Statements of Cash Flows - USD ($)
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 584,242 $ 452,448
Adjustments to reconcile net income to net cash provided by (used for) operating activities:    
Depreciation 213,466 162,547
Amortization 4,776 9,308
Non-cash interest expense 2,941 1,309
Deferred income taxes 252,912 222,004
Stock-based compensation 46,763 8,908
Gain on disposal of fixed assets (3,663)
Provision for uncollectible accounts, net 1,080 560
Changes in:    
Accounts receivable, gross (20,352) (702,315)
Accrued interest income 13,658 (5,934)
Inventory 27,965 2,305
Prepaid expenses and other current assets 33,584 (71,269)
Accounts payable and accrued expenses 128,069 (167,112)
Deferred revenue (33,856)
Net cash provided by (used for) operating activities 1,251,585 (87,241)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of property, plant and equipment (4,932,828) (311,480)
Acquisition of certain business assets (368,219)
Maturities of investments 2,731,000 496,000
Purchases of investments (249,000) (1,984,000)
Proceeds from sale of fixed assets 45,000
Net cash used for investing activities (2,405,828) (2,167,699)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from public offering, net 5,313,223
Proceeds from debt issuance 340,000
Debt principal repayments (35,295) (33,414)
Debt issuance costs (54,036) (36,893)
Proceeds from exercise of stock options 5,250
Net cash provided by financing activities 255,919 5,242,916
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS (898,324) 2,987,976
BEGINNING CASH AND CASH EQUIVALENTS 5,150,344 1,573,328
ENDING CASH AND CASH EQUIVALENTS 4,252,020 4,561,304
CASH PAID FOR:    
Income taxes 1,125
Interest expense 36,556 38,713
NON-CASH ACTIVITIES:    
Change in capital expenditures included in accounts payable and accrued expenses (399,541) 100,678
Net change in fair value of interest rate swaps (10,070) 65,074
Fixed asset disposals, gross $ 431,970