(Unaudited Condensed) Statements of Cash Flows - USD ($)	3 Months Ended
Mar. 31, 2018	Mar. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:
Net (loss) income	$ (221,123)	$ 584,242
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation	279,896	213,466
Amortization	4,776	4,776
Non-cash interest expense	4,204	2,941
Deferred income taxes	(46,276)	252,912
Stock-based compensation	71,048	46,763
Gain on disposal of fixed assets		(3,663)
Provision for uncollectible accounts		1,080
Changes in:
Accounts receivable	344,123	(20,352)
Accrued interest income		13,658
Inventory	119,806	27,965
Prepaid expenses and other current assets	(87,072)	33,584
Other assets	(4,911)
Accounts payable and accrued expenses	(214,809)	131,838
Deferred revenue		(33,856)
Net cash provided by operating activities	249,662	1,255,354
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of property, plant and equipment	(1,213,252)	(4,932,828)
Payment of contingent royalties related to 2016 acquisition	(5,723)	(3,769)
Maturities of investments		2,731,000
Purchases of investments		(249,000)
Proceeds from sale of fixed assets		45,000
Net cash used in investing activities	(1,218,975)	(2,409,597)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from Debt Issuance	267,141	340,000
Debt principal repayments	(39,803)	(35,295)
Payments of debt issuance costs	(522)	(54,036)
Proceeds from exercise of stock options	4,156	5,250
Net cash provided by financing activities	230,972	255,919
NET DECREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	(738,341)	(898,324)
BEGINNING CASH, CASH EQUIVALENTS AND RESTRICTED CASH	3,798,811	5,150,344
ENDING CASH, CASH EQUIVALENTS AND RESTRICTED CASH	3,060,470	4,252,020
CASH PAID FOR:
Income taxes
Interest expense	89,313	36,556
NON-CASH ACTIVITIES:
Change in capital expenditures included in accounts payable and accrued expenses	(574,288)	(399,541)
Net change in fair value of interest rate swaps	(43,859)	(10,070)
Fixed asset disposals, gross	$ 3,430	$ 431,970

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