Note 9 - Pension Plans - Information on Plan Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Mar. 31, 2015
Fair Value, Inputs, Level 1 [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plan, Fair Value of Plan Assets	$ 1,157	$ 2,588
Fair Value, Inputs, Level 1 [Member] | Foreign Exchange Contract [Member]
Defined Benefit Plan, Fair Value of Plan Assets
Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member]
Defined Benefit Plan, Fair Value of Plan Assets	$ 3,876	$ 19,997
Fair Value, Inputs, Level 1 [Member] | Fixed Income Funds [Member]
Defined Benefit Plan, Fair Value of Plan Assets	$ 1,101	$ 861
Fair Value, Inputs, Level 1 [Member] | Mutual Funds [Member]
Defined Benefit Plan, Fair Value of Plan Assets
Fair Value, Inputs, Level 1 [Member] | Collateralized Mortgage Backed Securities [Member]
Defined Benefit Plan, Fair Value of Plan Assets
Fair Value, Inputs, Level 1 [Member] | Other Contract [Member]
Defined Benefit Plan, Fair Value of Plan Assets		$ 2
Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan, Fair Value of Plan Assets	$ 6,134	$ 23,448
Fair Value, Inputs, Level 2 [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plan, Fair Value of Plan Assets
Fair Value, Inputs, Level 2 [Member] | Foreign Exchange Contract [Member]
Defined Benefit Plan, Fair Value of Plan Assets	$ (125)	$ (30)
Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member]
Defined Benefit Plan, Fair Value of Plan Assets		652
Fair Value, Inputs, Level 2 [Member] | Fixed Income Funds [Member]
Defined Benefit Plan, Fair Value of Plan Assets	$ 13,055	$ 5,887
Fair Value, Inputs, Level 2 [Member] | Mutual Funds [Member]
Defined Benefit Plan, Fair Value of Plan Assets	9,484
Fair Value, Inputs, Level 2 [Member] | Collateralized Mortgage Backed Securities [Member]
Defined Benefit Plan, Fair Value of Plan Assets	34	$ 16
Fair Value, Inputs, Level 2 [Member] | Other Contract [Member]
Defined Benefit Plan, Fair Value of Plan Assets	249	133
Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Fair Value of Plan Assets	$ 22,697	$ 6,658
Fair Value, Inputs, Level 3 [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plan, Fair Value of Plan Assets
Fair Value, Inputs, Level 3 [Member] | Foreign Exchange Contract [Member]
Defined Benefit Plan, Fair Value of Plan Assets
Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member]
Defined Benefit Plan, Fair Value of Plan Assets		$ 7
Fair Value, Inputs, Level 3 [Member] | Fixed Income Funds [Member]
Defined Benefit Plan, Fair Value of Plan Assets	$ 1	$ 1
Fair Value, Inputs, Level 3 [Member] | Mutual Funds [Member]
Defined Benefit Plan, Fair Value of Plan Assets
Fair Value, Inputs, Level 3 [Member] | Collateralized Mortgage Backed Securities [Member]
Defined Benefit Plan, Fair Value of Plan Assets
Fair Value, Inputs, Level 3 [Member] | Other Contract [Member]
Defined Benefit Plan, Fair Value of Plan Assets
Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan, Fair Value of Plan Assets	$ 1	$ 8
Cash and Cash Equivalents [Member]
Defined Benefit Plan, Fair Value of Plan Assets	1,157	2,588
Foreign Exchange Contract [Member]
Defined Benefit Plan, Fair Value of Plan Assets	(125)	(30)
Equity Securities [Member]
Defined Benefit Plan, Fair Value of Plan Assets	3,876	20,656
Fixed Income Funds [Member]
Defined Benefit Plan, Fair Value of Plan Assets	14,157	$ 6,749
Mutual Funds [Member]
Defined Benefit Plan, Fair Value of Plan Assets	9,484
Collateralized Mortgage Backed Securities [Member]
Defined Benefit Plan, Fair Value of Plan Assets	34	$ 16
Other Contract [Member]
Defined Benefit Plan, Fair Value of Plan Assets	249	135
Defined Benefit Plan, Fair Value of Plan Assets	$ 28,832	$ 30,114