Note 9 - Pension Plans - Information on Plan Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Fair Value, Inputs, Level 1 [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plan, Fair Value of Plan Assets	$ 121	$ 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	$ 351	$ 19,997
Fair Value, Inputs, Level 1 [Member] | Fixed Income Funds [Member]
Defined Benefit Plan, Fair Value of Plan Assets	1,225	$ 861
Fair Value, Inputs, Level 1 [Member] | Mutual Fund [Member]
Defined Benefit Plan, Fair Value of Plan Assets	$ 13,527
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	$ 15,224	$ 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		$ (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	$ 96	$ 5,887
Fair Value, Inputs, Level 2 [Member] | Mutual Fund [Member]
Defined Benefit Plan, Fair Value of Plan Assets	$ 13,394
Fair Value, Inputs, Level 2 [Member] | Collateralized Mortgage Backed Securities [Member]
Defined Benefit Plan, Fair Value of Plan Assets		$ 16
Fair Value, Inputs, Level 2 [Member] | Other Contract [Member]
Defined Benefit Plan, Fair Value of Plan Assets		133
Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Fair Value of Plan Assets	$ 13,490	$ 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
Fair Value, Inputs, Level 3 [Member] | Mutual Fund [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		$ 8
Cash and Cash Equivalents [Member]
Defined Benefit Plan, Fair Value of Plan Assets	$ 121	2,588
Foreign Exchange Contract [Member]
Defined Benefit Plan, Fair Value of Plan Assets		(30)
Equity Securities [Member]
Defined Benefit Plan, Fair Value of Plan Assets	$ 351	20,656
Fixed Income Funds [Member]
Defined Benefit Plan, Fair Value of Plan Assets	1,321	$ 6,749
Mutual Fund [Member]
Defined Benefit Plan, Fair Value of Plan Assets	$ 26,921
Collateralized Mortgage Backed Securities [Member]
Defined Benefit Plan, Fair Value of Plan Assets		$ 16
Other Contract [Member]
Defined Benefit Plan, Fair Value of Plan Assets		135
Defined Benefit Plan, Fair Value of Plan Assets	$ 28,714	$ 30,114	$ 29,013