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Statements of Cash Flows - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net loss $ (2,321,671) $ (168,147)
Adjustments to reconcile net loss to net cash (used for) provided by operating activities:    
Depreciation 1,501,607 885,331
Amortization 19,104 19,104
Non-cash interest expense 16,829 15,291
Deferred income taxes 462,315 (284,809)
Stock-based compensation 344,016 199,783
Gain on sale of assets (700,000)
Loss (gain) on disposal of fixed assets 1,733 (2,323)
Recovery of provision for uncollectible accounts, net (21,326)
Changes in:    
Trade accounts receivable, gross 411,724 (330,306)
Accrued interest income 24,013
Inventory (281,939) 77,167
Prepaid expenses and other current assets 128,849 289,816
Other assets (12,033) 33,344
Accounts payable and accrued expenses 80,162 448,641
Deferred revenue (24,100) (9,756)
Net cash (used for) provided by operating activities (373,404) 1,175,823
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of property, plant and equipment (2,029,895) (17,759,876)
Payment of contingent royalties related to 2016 acquisition (14,077) (8,661)
Maturities of investments 5,699,000
Purchases of investments (249,000)
Proceeds from sale of assets 250,000
Proceeds from sale of fixed assets 45,000
Net cash used for investing activities (1,793,972) (12,273,537)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from public offering, net 2,734,174
Proceeds from private placement, net 1,034,164
Proceeds from debt issuance 693,640 6,146,360
Proceeds from line of credit 500,000
Debt principal repayments (398,308) (151,976)
Payments of debt issuance costs (1,971) (66,101)
Proceeds from exercise of stock options 96,254 49,560
Net cash provided by financing activities 889,615 9,746,181
NET DECREASE IN CASH AND CASH EQUIVALENTS (1,277,761) (1,351,533)
BEGINNING CASH AND CASH EQUIVALENTS 3,798,811 5,150,344
ENDING CASH AND CASH EQUIVALENTS 2,521,050 3,798,811
CASH PAID FOR:    
Income taxes 4,222 6,066
Interest expense 403,535 186,542
NON-CASH ACTIVITIES:    
Change in capital expenditures included in accounts payable and accrued expenses (568,695) (608,473)
Net change in fair value of interest rate swaps (30,795) (23,264)
Fixed asset disposals, gross $ 22,681 $ 3,478