CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Cash flows from operating activities:
Net income	$ 3,026,909	$ 1,171,603
Adjustments to reconcile net income to net cash provided by operating activities:
Stock-based compensation expense	390,269	350,978
Change in fair value of derivative instrument	(8,041)	(205,156)
Gain on disposition of long-term assets	(44,889)	(12,563)
Depreciation and amortization	1,795,379	1,217,850
Deferred income taxes	(696,569)	(115,378)
Excess tax benefit from employee stock plans	(19,670)	(57,714)
Changes in operating assets and liabilities:
Trade accounts receivable, net	(589,435)	(96,919)
Other receivables	47,421	211,569
Inventories	(603,719)	795,264
Prepaid income taxes	(66,391)	(208,602)
Prepaid expenses, other	(231,019)	(119,614)
Accounts payable	758,978	(181,288)
Compensation and related expenses	(227,579)	(810,071)
Other accrued expenses	(4,666)	(69,682)
Accrued product warranties	(1,738)	(35,166)
Accrued income taxes	503,719	(706,124)
Deferred revenue	385,608	(734,359)
Net cash provided by operating activities	4,414,567	394,628
Cash flows from investing activities:
Purchases of marketable securities		(365,000)
Proceeds from maturities of marketable securities	5,254,639	3,704,521
Purchases of property, plant and equipment	(1,308,243)	(1,070,682)
Proceeds from sale of property and equipment	116,234	171,461
Payment for purchase of Dansensor, net of cash acquired		(12,764,429)
Cash paid for patents and other intangible assets	(669,154)	(207,642)
Other	(2,259)	3,296
Net cash provided by (used in) investing activities	3,391,217	(10,528,475)
Cash flows from financing activities:
Proceeds from the revolving lines of credit	4,757,484	6,875,000
Payments on the revolving lines of credit	(7,532,789)	(2,387,353)
Proceeds from term note payable		3,500,000
Payments on notes payable and seller financed note payable	(1,453,660)	(2,559,102)
Proceeds from the exercise of stock options	256,212	350,088
Excess tax benefit from employee stock plans	19,670	57,714
Dividends paid	(1,798,208)	(1,693,790)
Net cash provided by (used in) financing activities	(5,751,291)	4,142,557
Effect of exchange rate changes on cash and cash equivalents	24,407	(53,893)
Net increase (decrease) in cash and cash equivalents	2,078,900	(6,045,183)
Cash and cash equivalents:
Beginning of period	2,415,416	8,425,846
End of period	4,494,316	2,380,663
Supplemental disclosures of cash flow information:
Cash paid during the period for income taxes	1,166,483	1,584,839
Cash paid during the period for interest	221,299	87,250
Supplemental schedule of noncash investing and financing activities:
Dividends accrued	610,404	575,672
Purchases of fixed assets and intangibles in accounts payable	217,344	220,088
Seller financed note payable for the acquisition of Dansensor		6,378,800
The Company purchased all of the common shares of Dansensor for $20,081,600 on April 2, 2012. The reconciliation of cash paid and liabilities assumed is as follows:
Fair value of assets acquired		26,938,817
Liabilities assumed		(6,857,217)
Net acquired assets		20,081,600
Seller financed note payable		(6,484,413)
Cash acquired		(832,758)
Payment for purchase of Dansensor, net of cash acquired and seller financed note payable		$ 12,764,429