Unaudited Condensed Statements of Cash Flows - USD ($)	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 365,853	$ 443,292
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	421,138	368,358
Amortization	9,552	15,442
Non-cash interest expense	7,011	3,843
Deferred income taxes	179,054	217,825
Stock-based compensation	101,113	28,952
Gain on disposal of fixed assets	(3,663)
Provision for uncollectible accounts, net	(17,411)	1,550
Changes in:
Accounts receivable, gross	304,783	(230,740)
Accrued interest income	21,431	(9,260)
Inventory	(488,788)	(245,671)
Prepaid expenses and other current assets	225,536	(237,135)
Other assets	(920)
Accounts payable and accrued expenses	5,633	(190,399)
Deferred revenue	(33,856)
Net cash provided by operating activities	1,096,466	166,057
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of property, plant and equipment	(8,616,542)	(691,278)
Acquisition of certain business assets		(368,219)
Maturities of investments	5,212,000	1,984,000
Purchases of investments	(249,000)	(4,216,000)
Proceeds from sale of fixed assets	45,000
Net cash used for investing activities	(3,608,542)	(3,291,497)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from public offering, net		5,313,223
Proceeds from debt issuance	840,000
Proceeds from line of credit	500,000
Debt principal repayments	(73,572)	(66,828)
Debt issuance costs	(62,314)	(46,734)
Proceeds from exercise of stock options	5,250	3,150
Net cash provided by financing activities	1,209,364	5,202,811
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(1,302,712)	2,077,371
BEGINNING CASH AND CASH EQUIVALENTS	5,150,344	1,573,328
ENDING CASH AND CASH EQUIVALENTS	3,847,632	3,650,699
CASH PAID FOR:
Income taxes	4,000	125,125
Interest expense	76,252	77,415
NON-CASH ACTIVITIES:
Change in capital expenditures included in accounts payable and accrued expenses	1,710,136	328,222
Net change in fair value of interest rate swaps	(1,594)	95,290
Fixed asset disposals, gross	$ 431,970