CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Cash flows from operating activities:
Net income	$ 4,715	$ 3,229
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	2,053	1,735
Investment premium amortization, net	145	185
Net loss on disposals of property and equipment	2	0
Foreign exchange (gain) loss	30	(115)
Share-based compensation expense	2,032	2,249
Excess tax benefits from share-based awards	(100)	(1,397)
Deferred income taxes	(722)	(253)
Equity in net (income) loss of unconsolidated affiliate	49	(30)
Changes in assets and liabilities:
Receivables, net	(3,999)	7,708
Inventories	(1,017)	(1,096)
Prepaid expenses and other current assets	693	2,356
Other assets	(55)	7
Accounts payable	941	(1,958)
Accrued payroll and related expenses	2,223	(128)
Accrued taxes	2,486	(105)
Other accrued liabilities	756	(178)
Deferred rent	0	11
Deferred revenue	(222)	(6)
Warranty reserve	5	(57)
Net cash provided by operating activities	10,015	12,157
Cash flows from investing activities:
Purchases of held-to-maturity investments	(4,829)	(8,036)
Proceeds from maturities and redemptions of available-for-sale investments	498	0
Proceeds from maturities and redemptions of held-to-maturity investments	13,237	12,127
Purchases of property and equipment	(1,677)	(1,228)
Net cash provided by investing activities	7,229	2,863
Cash flows from financing activities:
Proceeds from the exercise of stock options	4	17
Tax withholdings related to net share settlements of restricted stock units	(1,583)	(3,712)
Excess tax benefits from share-based awards	100	1,397
Proceeds from the exercise of warrants	60	0
Dividends paid	(2,246)	0
Net cash used in financing activities	(3,665)	(2,298)
Effect of exchange rate changes on cash and cash equivalents	(65)	154
Net increase in cash and cash equivalents	13,514	12,876
Cash and cash equivalents at beginning of period	73,589	54,910
Cash and cash equivalents at end of period	87,103	67,786
Supplemental disclosure of cash flow information:
Cash paid for income taxes, net of refunds	492	189
Supplemental disclosure of non-cash flow information:
Change in unrealized gain (loss) on investments, net of tax	4	(13)
Transfers of equipment between inventory and property and equipment, net	547	402
Net change in capitalized share-based compensation	105	50
Common stock withheld for employee taxes in connection with share-based compensation	1,583	3,712
Repayment of notes payable by credits from municipal agency	$ 25	$ 25