CONDENSED STATEMENTS OF CASH FLOWS - USD ($)	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ (201,223)	$ 403,347
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation	327,759	320,140
Amortization	13,161	12,887
Stock based compensation	10,433	11,502
Loss on disposal of property, plant and equipment		3,102
Loss on intangible asset abandonment	45,873
Changes in working capital components:
Trade receivables	(58,580)	(193,186)
Inventories	266,757	(76,405)
Prepaid expenses and other assets	(59,520)	(31,713)
Income taxes receivable	(82,460)	(33,307)
Accounts payable	225,036	(20,571)
Accrued expenses	(17,818)	(31,419)
Net cash provided by operating activities	469,418	364,377
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property, plant and equipment	(567,578)	(403,212)
Proceeds from sales of equipment and vehicles		9,163
Purchases of intangibles	(30,276)	(38,590)
Purchases of short-term investments	(650,000)	(1,510,000)
Proceeds on sale of short-term investments	1,211,000	958,948
Net cash used in investing activities	(36,854)	(983,691)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from exercise of stock options		44,730
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	432,564	(574,584)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	1,936,214	1,704,300
CASH AND CASH EQUIVALENTS AT END OF PERIOD	2,368,778	1,129,716
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Cash paid for income taxes	$ 10,805	$ 241,624