Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Cash flows from operating activities:
Net income	$ 18,769	$ 15,227	$ 15,670
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	7,543	7,594	7,880
Reduction of goodwill from disposition of product line	0	2,711	0
Gain on sale of discontinued operations	0	0	(5,849)
Provision for accounts receivable allowances	2,862	4,746	4,884
Deferred tax provision (benefit)	2,511	(4,257)	5,552
(Gain) loss on sale or disposal of assets	(8)	155	(784)
Share-based compensation expense	1,843	1,783	1,683
Changes in assets and liabilities:
(Increase) in accounts receivable	(3,972)	(2,952)	(7,499)
Decrease (increase) in inventories	3,346	8,106	(2,578)
(Increase) decrease in other assets	(1,282)	(704)	757
(Decrease) in accounts payable	(2,536)	(4,073)	(7,541)
(Decrease) increase in accrued income taxes	(726)	1,290	47
(Decrease) increase in accrued expenses and long-term obligations	(110)	1,802	1,188
Net cash provided by operating activities-continuing operations	28,240	31,428	13,410
Net cash (used for) provided by operating activities-discontinued operations	(410)	(1,565)	12,386
Net cash provided by operating activities	27,830	29,863	25,796
Cash flows from investing activities:
Purchase of held-to-maturity investment securities	(29,862)	0	0
Purchase of property, plant and equipment	(5,024)	(4,494)	(3,532)
Proceeds from disposition of product line, net	0	1,758	0
Proceeds from sale of assets	8	17	57
Net cash used for investing activities-continuing operations	(34,878)	(2,719)	(3,475)
Net cash provided by investing activities-discontinued operations	500	4,500	2,509
Net cash (used for) provided by investing activities	(34,378)	1,781	(966)
Cash flows from financing activities:
Payments on long-term debt obligations	0	0	(66)
Borrowings on notes payable	0	0	74,270
Payments on notes payable	0	0	(74,270)
Dividends paid	(5,637)	(5,731)	(5,837)
Purchase of treasury stock	(6,634)	(4,864)	(1,648)
Proceeds from exercise of stock options	49	192	365
Payments for tax withholding on net restricted stock settlements	(563)	(262)	(60)
Tax effect of stock awards	425	(6)	(26)
Net cash used for financing activities	(12,360)	(10,671)	(7,272)
Net (decrease) increase in cash and cash equivalents	(18,908)	20,973	17,558
Cash and cash equivalents at beginning of period	87,108	66,135	48,577
Cash and cash equivalents at end of period	$ 68,200	$ 87,108	$ 66,135