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(Unaudited Condensed) Statements of Cash Flows - USD ($)
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net (loss) income $ (1,269,442) $ 26,508
Adjustments to reconcile net (loss) income to net cash (used for) provided by operating activities:    
Depreciation 938,416 627,141
Amortization 14,328 14,328
Non-cash interest expense 12,612 11,120
Deferred income taxes 447,770 9,112
Stock-based compensation 257,697 148,035
Gain on sale of assets (700,000)
Gain on disposal of fixed assets (3,663)
Recovery of uncollectible accounts, net (17,643)
Changes in:    
Trade accounts receivable, gross 490,050 141,114
Accrued interest income 24,013
Inventory (200,210) (605,126)
Prepaid expenses and other current assets (156,185) 242,683
Other assets (11,547) (920)
Accounts payable and accrued expenses (58,545) 262,270
Deferred revenue (33,856)
Net cash (used for) provided by operating activities (235,056) 845,116
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of property, plant and equipment (1,931,146) (13,079,386)
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 (1,695,223) (7,593,047)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from private placement, net 1,037,164
Proceeds from debt issuance 693,640 3,024,343
Debt principal repayments (183,887) (111,981)
Debt issuance costs (522) (63,358)
Proceeds from exercise of stock options 15,500 16,500
Tax benefits related to stock options 183
Net cash provided by financing activities 524,731 3,902,851
NET DECREASE IN CASH AND CASH EQUIVALENTS (1,405,548) (2,845,080)
BEGINNING CASH AND CASH EQUIVALENTS 3,798,811 5,150,344
ENDING CASH AND CASH EQUIVALENTS 2,393,263 2,305,264
CASH PAID FOR:    
Income taxes 4,222 4,000
Interest 294,728 123,034
NON-CASH ACTIVITIES:    
Change in capital expenditures included in accounts payable and accrued expenses (589,964) 1,286,289
Net change in fair value of interest rate swaps (74,430) (3,419)
Fixed asset disposals, gross $ 18,554 $ 1,500