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Statements of Cash Flows - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 508,448 $ 1,213,239
Adjustments to reconcile net income to net cash (used for) provided by operating activities:    
Depreciation 783,275 525,918
Amortization 19,104
Non-cash interest expense 8,891 3,343
Deferred income taxes 236,289 821,469
Stock-based compensation 67,399 23,222
Loss (gain) on disposal of fixed assets 25,385 (3,984)
Provision for uncollectible accounts, net 3,234 1,898
Changes in:    
Accounts receivable, gross (277,521) 249,290
Accrued interest income (14,791) (3,706)
Inventory (1,143,693) 75,548
Prepaid expenses and other current assets (391,270) (59,672)
Accounts payable and accrued expenses (182,508) 60,361
Deferred revenue 33,856 (6,690)
Net cash (used for) provided by operating activities (323,902) 2,900,236
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of property, plant and equipment (3,586,349) (2,719,189)
Acquisition of certain business assets (368,219)
Maturities of investments 4,464,000 2,489,000
Purchases of investments (4,963,000) (4,455,000)
Proceeds from sale of fixed assets 30,939 66,215
Net cash used for investing activities (4,422,629) (4,618,974)
CASH FLOWS FROM FINANCING ACTIVITES:    
Proceeds from public offering, net 5,313,223
Proceeds from private placement, net 3,160,923
Proceeds from debt issuance 2,500,000
Debt principal repayments (135,840) (169,753)
Debt issuance costs (46,734) (34,125)
Proceeds from exercise of stock options 31,975 120,210
Tax benefits related to stock options 25,706
Net cash provided by financing activities 8,323,547 2,442,038
NET INCREASE IN CASH AND CASH EQUIVALENTS 3,577,016 723,300
BEGINNING CASH AND CASH EQUIVALENTS 1,573,328 850,028
ENDING CASH AND CASH EQUIVALENTS 5,150,344 1,573,328
CASH PAID FOR:    
Income taxes 123,584 3,133
Interest expense 153,093 77,159
NON-CASH ACTIVITIES:    
Change in capital expenditures included in accounts payable and accrued expenses 1,248,352 (249,873)
Net change in fair value of interest rate swaps (26,354) 26,925
Fixed asset disposals, gross $ 140,901 $ 283,594