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(Unaudited Condensed) Statements of Cash Flows - USD ($)
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net (loss) income $ (1,019,486) $ 365,853
Adjustments to reconcile net (loss) income to net cash provided by operating activities:    
Depreciation 560,588 421,138
Amortization 9,552 9,552
Non-cash interest expense 8,408 7,011
Deferred income taxes 452,546 179,054
Stock-based compensation 167,991 101,113
Gain on disposal of fixed assets (3,663)
Recovery of uncollectible accounts, net (17,411)
Changes in:    
Accounts receivable, gross 358,806 304,783
Accrued interest income 21,431
Inventory 212,838 (488,788)
Prepaid expenses and other current assets (172,717) 225,536
Other assets (8,229) (920)
Accounts payable and accrued expenses (299,416) 9,402
Deferred revenue (33,856)
Net cash provided by operating activities 270,881 1,100,235
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of property, plant and equipment (1,715,180) (8,616,542)
Payment of contingent royalties related to 2016 acquisition (5,723) (3,769)
Maturities of investments 5,212,000
Purchases of investments (249,000)
Proceeds from sale of fixed assets 45,000
Net cash used in investing activities (1,720,903) (3,612,311)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from debt issuance 267,141 840,000
Proceeds from line of credit 500,000
Debt principal repayments (111,749) (73,572)
Debt issuance costs (522) (62,314)
Proceeds from exercise of stock options 10,860 5,250
Net cash provided by financing activities 165,730 1,209,364
NET DECREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH (1,284,292) (1,302,712)
BEGINNING CASH, CASH EQUIVALENTS AND RESTRICTED CASH 3,798,811 5,150,344
ENDING CASH, CASH EQUIVALENTS AND RESTRICTED CASH 2,514,519 3,847,632
CASH PAID FOR:    
Income taxes 4,000 4,000
Interest expense 189,968 76,252
NON-CASH ACTIVITIES:    
Change in capital expenditures included in accounts payable and accrued expenses (634,351) 1,710,136
Net change in fair value of interest rate swaps (60,100) (1,594)
Fixed asset disposals, gross $ 6,730 $ 431,970