CONDENSED STATEMENTS OF CASH FLOWS - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	$ (192,812)	$ (228,947)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation	162,751	160,843
Amortization	6,047	6,443
Stock based compensation	5,248	4,778
Loss on sale and disposal of property, plant and equipment	8,001
Changes in working capital components:
Trade receivables	(56,062)	345,897
Inventories	(134,229)	(112,712)
Prepaid expenses and other assets	(96,474)	(179,665)
Income tax receivable	(139,119)	(250,925)
Accounts payable	170,805	486,526
Accrued expenses	110,076	258,891
Net cash provided by (used in) operating activities	(155,768)	491,129
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property, plant, equipment and construction in progress	(1,017,857)	(376,067)
Proceeds from sales of equipment	1,000
Purchases of intangibles	(14,242)	(17,996)
Purchases of short-term investments		(650,000)
Proceeds on sale of short-term investments		555,000
Net cash used in investing activities	(1,031,099)	(489,063)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from exercise of stock options	3,765
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	(1,183,102)	2,066
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	2,248,466	1,936,214
CASH AND CASH EQUIVALENTS AT END OF PERIOD	1,065,364	1,938,280
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Construction in progress included in construction payable	96,166
Cash paid for income taxes	$ 11,740	$ 10,802