CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Cash flows from operating activities:
Net income (loss)	$ (515)	$ 1,454
Adjustments to reconcile net income (loss) to net cash used for operating activities:
Depreciation and amortization	1,006	1,312
Provisions for contracts, inventory and accounts receivable reserves	35	(420)
Amortization of bond premium	34	289
Stock compensation expense	334	779
Changes in assets and liabilities:
Accounts receivable	(3,114)	4,068
Unbilled costs and fees	(2,475)	(678)
Inventories	3,706	(4,297)
Prepaid expenses and other assets	1,101	(4,474)
Accounts payable	(3,141)	(3,124)
Accrued income taxes		(2,072)
Customer deposits	(2,474)	4,396
Deferred revenue	309	115
Accrued expenses and other liabilities	(645)	(5,591)
Net cash used for operating activities	(5,839)	(8,243)
Cash flows from investing activities:
Purchases of short-term investments		(21,133)
Proceeds from sales and maturities of short-term investments	3,380	22,000
Purchases of property and equipment, net	(258)	(396)
Net cash provided by investing activities	3,122	471
Cash flows from financing activities:
Decrease in restricted cash	855
Proceeds from exercise of stock options		116
Repurchase of shares of common stock	(2,263)
Repayment of leasehold financing liability		(376)
Payment of common stock dividend	(3,611)	(3,991)
Net cash used for financing activities	(5,019)	(4,251)
Net decrease in cash and cash equivalents	(7,736)	(12,023)
Cash and cash equivalents at beginning of period	68,835	62,143
Cash and cash equivalents at end of period	$ 61,099	$ 50,120