Consolidated Statements of Cash Flows (unaudited) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Operating activities
Net earnings	$ 2,207,000	$ 2,799,000
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation	1,048,000	772,000
Amortization	405,000	412,000
Stock-based compensation	1,511,000	1,285,000
Deferred taxes, net	638,000	446,000
Tax benefit from stock-based awards	(248,000)	(397,000)
Gain on disposal of equipment	0	(5,000)
Change in accounts receivable allowance	55,000	80,000
Changes in operating assets and liabilities:
Accounts receivable	(1,102,000)	(1,443,000)
Inventories	(2,089,000)	(1,233,000)
Prepaid expenses and other	128,000	(629,000)
Accounts payable	1,482,000	1,548,000
Accrued expenses and compensation	967,000	404,000
Amortization of deferred license fees and other deferred revenue	(102,000)	(77,000)
Net cash provided by operating activities	4,900,000	3,962,000
Investing activities
Purchase of property and equipment	(2,661,000)	(1,323,000)
Purchase of building and land	(2,748,000)	0
Proceeds from the sale of equipment	0	9,000
Net cash used in investing activities	(5,409,000)	(1,314,000)
Financing activities
Repurchase of common shares	(1,951,000)	(1,805,000)
Tax benefit from stock-based awards	248,000	397,000
Proceeds from the exercise of stock options and sale of stock, net of expenses	162,000	895,000
Net cash used in financing activities	(1,541,000)	(513,000)
Increase (decrease) in cash and cash equivalents	(2,050,000)	2,135,000
Effect of exchange rate changes on cash and cash equivalents	(244,000)	(158,000)
Cash and cash equivalents at beginning of period	36,461,000	30,785,000
Cash and cash equivalents at end of period	34,167,000	32,762,000
Supplemental disclosure of cash flow
Cash paid for interest	0	3,000
Cash paid for taxes	$ 256,000	$ 459,000