Statements of Cash Flows (Unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ 144,555	$ (221,123)
Adjustments to reconcile net income (loss) to net cash  provided by operating activities:
Depreciation	563,805	279,896
Amortization	4,776	4,776
Amortization of debt issue costs	4,244	4,204
Deferred income taxes	9,023	(46,276)
Stock-based compensation	82,835	71,048
Changes in:
Accounts receivable	(350,798)	344,123
Inventory	295,878	119,806
Prepaid expenses and other current assets	(119,420)	(87,072)
Other assets	8,594	(4,911)
Accounts payable and accrued expenses	33,705	(214,809)
Net cash provided by operating activities	677,197	249,662
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of property, plant and equipment	(194,403)	(1,213,252)
Payment of contingent royalties related to 2016 acquisition	(8,914)	(5,723)
Net cash used in investing activities	(203,317)	(1,218,975)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from public offering, net	8,303,436
Proceeds from debt issue		267,141
Line of credit repayment	(500,000)
Debt principal repayments	(214,301)	(39,803)
Payments of debt issue costs		(522)
Proceeds from exercise of stock options	2	4,156
Net cash provided by financing activities	7,589,137	230,972
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	8,063,017	(738,341)
BEGINNING CASH AND CASH EQUIVALENTS	2,521,050	3,798,811
ENDING CASH AND CASH EQUIVALENTS	10,584,067	3,060,470
CASH PAID FOR:
Income taxes
Interest expense	112,227	89,313
NON-CASH ACTIVITIES:
Change in capital expenditures included in accounts payable and accrued expenses	(72,695)	(574,288)
Net change in fair value of interest rate swaps, net of taxes	27,069	(43,859)
Fixed asset disposals, gross	$ 1,830	$ 3,430