CONDENSED STATEMENTS OF CASH FLOWS - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	$ (378,897)	$ (192,812)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation	212,302	162,751
Amortization	9,574	6,047
Stock based compensation	5,461	5,248
Net loss on sale and disposal of property, plant and equipment		8,001
Changes in working capital components:
Trade receivables	405,542	(56,062)
Inventories	(246,362)	(134,229)
Prepaid expenses and other assets	(29,930)	(96,474)
Income tax receivable	(214,359)	(139,119)
Accounts payable	111,754	170,805
Accrued expenses	(120,476)	110,076
Net cash used in operating activities	(245,391)	(155,768)
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property, plant, equipment and construction in progress	(60,417)	(1,017,857)
Proceeds from sale of equipment		1,000
Purchases of intangibles	(7,682)	(14,242)
Purchases of short-term investments	(1,225,000)
Proceeds on sale of short-term investments	1,133,000
Net cash used in investing activities	(160,099)	(1,031,099)
CASH FLOWS FROM FINANCING ACTIVITIES:
Payments on long-term debt	(34,883)
Proceeds from exercise of stock options		3,765
Net cash provided by (used in) financing activities	(34,883)	3,765
NET DECREASE IN CASH AND CASH EQUIVALENTS	(440,373)	(1,183,102)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	1,048,713	2,248,466
CASH AND CASH EQUIVALENTS AT END OF PERIOD	608,340	1,065,364
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Construction in progress included in accounts payable		96,166
Cash paid for interest	17,786
Cash received (paid) for income taxes, net	$ 8,564	$ (11,740)