Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Cash flows from operating activities:
Net income	$ 17,825	$ 18,290
Adjustments to reconcile net income to net cash (used for) provided by operating activities:
Depreciation and amortization	6,129	5,835
Accretion of investment discount	(207)	(145)
Provision for accounts receivable allowances	2,048	1,748
Deferred tax provision	1,409	954
Stock-based compensation expense	1,235	1,533
Loss on sale of assets	15	0
Changes in assets and liabilities:
Accounts receivable	(38,974)	(41,218)
Inventory	(1,588)	(1,600)
Other assets	635	1,497
Accounts payable	4,498	7,569
Other accrued liabilities	5,602	7,643
Total adjustments	(19,198)	(16,184)
Net cash (used for) provided by operating activities	(1,373)	2,106
Cash flows from investing activities:
Maturities of investment securities	70,000	30,000
Purchase of held-to-maturity investment securities	(59,683)	(39,795)
Purchase of a business	0	(5,142)
Purchase of property, plant and equipment	(5,058)	(2,938)
Proceeds from sale of fixed assets	23	5
Net cash provided by (used for) investing activities	5,282	(17,870)
Cash flows from financing activities:
Dividends paid	(4,953)	(4,196)
Purchase of treasury stock	(10,000)	0
Exercise of stock options, net of tax withholdings	122	56
Payments for tax withholding on net restricted stock settlements	(518)	(291)
Tax effect on stock awards	259	158
Net cash used for financing activities	(15,090)	(4,273)
Net decrease in cash and cash equivalents	(11,181)	(20,037)
Cash and cash equivalents at beginning of period	36,429	68,200
Cash and cash equivalents at end of period	$ 25,248	$ 48,163