Note 10 - Pension Plans - Information on Plan Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Mar. 31, 2015
Fair Value, Inputs, Level 1 [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plan, Fair Value of Plan Assets	$ 1,608	$ 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	$ 4,011	$ 19,997
Fair Value, Inputs, Level 1 [Member] | Fixed Income Funds [Member]
Defined Benefit Plan, Fair Value of Plan Assets	$ 1,173	$ 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	$ 6,792	$ 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	$ (72)	$ (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	$ 12,470	$ 5,887
Fair Value, Inputs, Level 2 [Member] | Mutual Funds [Member]
Defined Benefit Plan, Fair Value of Plan Assets	8,948
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	233	133
Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Fair Value of Plan Assets	$ 21,613	$ 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	1,608	2,588
Foreign Exchange Contract [Member]
Defined Benefit Plan, Fair Value of Plan Assets	(72)	(30)
Equity Securities [Member]
Defined Benefit Plan, Fair Value of Plan Assets	4,011	20,656
Fixed Income Funds [Member]
Defined Benefit Plan, Fair Value of Plan Assets	13,644	$ 6,749
Mutual Funds [Member]
Defined Benefit Plan, Fair Value of Plan Assets	8,948
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	233	135
Defined Benefit Plan, Fair Value of Plan Assets	$ 28,406	$ 30,114