Statements of Cash Flows (Unaudited) - USD ($)	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	$ (482,600)	$ (1,019,486)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation	1,128,327	560,588
Amortization	9,552	9,552
Amortization of debt issue costs	8,488	8,408
Deferred income taxes	24,356	452,546
Stock-based compensation	152,916	167,991
Changes in:
Accounts receivable, gross	805	358,806
Accrued interest income	(38,329)
Inventory	(160,723)	212,838
Prepaid expenses and other current assets	(21,776)	(172,717)
Other assets	5,985	(8,229)
Accounts payable and accrued expenses	(280,462)	(299,416)
Net cash provided by operating activities	346,539	270,881
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of property, plant and equipment	(300,136)	(1,715,180)
Purchases of investments	(8,637,000)
Payment of contingent royalties related to 2016 acquisition	(8,914)	(5,723)
Net cash used in investing activities	(8,946,050)	(1,720,903)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from public offering, net	8,303,436
Proceeds from debt issuance		267,141
Line of credit repayment	(500,000)
Debt principal repayments	(428,961)	(111,749)
Payments of debt issue costs		(522)
Proceeds from exercise of stock options	2	10,860
Net cash provided by financing activities	7,374,477	165,730
NET DECREASE IN CASH AND CASH EQUIVALENTS	(1,225,034)	(1,284,292)
BEGINNING CASH AND CASH EQUIVALENTS	2,521,050	3,798,811
ENDING CASH AND CASH EQUIVALENTS	1,296,016	2,514,519
CASH PAID FOR:
Income taxes	4,700	4,000
Interest expense	220,178	189,968
NON-CASH ACTIVITIES:
Change in capital expenditures included in accounts payable and accrued expenses	(69,486)	(634,351)
Net change in fair value of interest rate swaps, net of taxes	73,069	(60,100)
Fixed asset disposals, gross	$ 6,394	$ 6,730