Income Taxes (Narrative) (Details) - USD ($)	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Operating Loss Carryforwards [Line Items]
Gross amounts of deferred tax assets	$ 125,612,000	$ 124,634,000
Valuation allowance	(4,585,000)	(4,131,000)
Foreign subsidiary income	3,071,000	5,448,000	$ 10,570,000
Cumulative undistributed earnings of foreign subsidiaries	116,000,000
Tax effects of award plans	(197,000)	118,000
Amount accrued for the payment of interest and penalties	21,000	14,000
Federal
Operating Loss Carryforwards [Line Items]
Foreign net operating losses	4,370,000	$ 3,426,000	$ 1,207,000
Prepaid Expenses and Other Current Assets [Member]
Operating Loss Carryforwards [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	8,300,000
Accrued Liabilities
Operating Loss Carryforwards [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	$ 158,000