CONDENSED STATEMENTS OF CASH FLOWS (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ (228,947)	$ 204,915
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation	160,843	158,576
Amortization	6,443	6,443
Stock based compensation	4,778	2,553
Changes in operating assets and liabilities:
Trade receivables	345,897	(162,220)
Inventories	(112,712)	(333,655)
Prepaid expenses and other assets	(179,665)	(58,704)
Income taxes receivable	(250,925)	16,400
Accounts payable	486,526	346,398
Accrued liabilities	258,891	87,351
Income taxes payable		85,940
Net cash provided by operating activities	491,129	353,997
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property, plant and equipment	(376,067)	(123,852)
Proceeds from sale of equipment and vehicles		7,591
Purchases of intangibles	(17,996)	(16,648)
Purchases of short-term investments	(650,000)	(350,000)
Proceeds from maturity of short-term investments	555,000	554,807
Net cash (used in) provided by investing activities	(489,063)	71,898
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from exercise of stock options		13,050
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	2,066	438,945
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	1,936,214	1,704,300
CASH AND CASH EQUIVALENTS AT END OF PERIOD	1,938,280	2,143,245
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Cash paid for income taxes	$ 10,802	$ 9,876