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Statements of Cash Flows - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net (loss) income $ (168,147) $ 508,448
Adjustments to reconcile net (loss) income to net cash provided by (used for) operating activities:    
Depreciation 885,331 783,275
Amortization 19,104 19,104
Non-cash interest expense 15,291 8,891
Deferred income taxes (284,809) 236,289
Stock-based compensation 199,783 67,399
(Gain) loss on disposal of fixed assets (2,323) 25,385
(Recovery of) provision for uncollectible accounts (21,326) 3,234
Changes in:    
Accounts receivable (330,306) (277,521)
Accrued interest income 24,013 (14,791)
Inventory 77,167 (1,143,693)
Prepaid expenses and other current assets 289,816 (391,270)
Other assets 33,344
Accounts payable and accrued expenses 448,641 (80,920)
Deferred revenue (9,756) 33,856
Net cash provided by (used for) operating activities 1,175,823 (222,314)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of property, plant and equipment (17,759,876) (3,586,349)
Acquisition of certain business assets (465,376)
Payment of contingent royalties related to 2016 acquisition (8,661) (4,431)
Maturities of investments 5,699,000 4,464,000
Purchases of investments (249,000) (4,963,000)
Proceeds from sale of fixed assets 45,000 30,939
Net cash used for investing activities (12,273,537) (4,524,217)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from public offering, net 2,734,174 5,313,223
Proceeds from private placement, net 1,034,164 3,160,923
Proceeds from Debt Issuance 6,146,360
Debt principal repayments (151,976) (135,840)
Payments of debt issuance costs (66,101) (46,734)
Proceeds from exercise of stock options 49,560 31,975
Net cash provided by financing activities 9,746,181 8,323,547
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS (1,351,533) 3,577,016
BEGINNING CASH AND CASH EQUIVALENTS 5,150,344 1,573,328
ENDING CASH AND CASH EQUIVALENTS 3,798,811 5,150,344
CASH PAID FOR:    
Income taxes 6,066 123,584
Interest expense 186,542 153,093
NON-CASH ACTIVITIES:    
Change in capital expenditures included in accounts payable and accrued expenses (608,473) 1,248,352
Net change in fair value of interest rate swaps (23,264) (26,354)
Fixed asset disposals, gross $ 3,478 $ 140,901