Note 12 - Retirement Plans (Details) - Major Categories of Assets Held By the Plan, Measured At Level 1 Fair Value (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Note 12 - Retirement Plans (Details) - Major Categories of Assets Held By the Plan, Measured At Level 1 Fair Value [Line Items]
Plan asset categories	$ 1,223	$ 1,143
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member]
Note 12 - Retirement Plans (Details) - Major Categories of Assets Held By the Plan, Measured At Level 1 Fair Value [Line Items]
Plan asset categories		23
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member]
Note 12 - Retirement Plans (Details) - Major Categories of Assets Held By the Plan, Measured At Level 1 Fair Value [Line Items]
Plan asset categories	24
Cash and Cash Equivalents [Member]
Note 12 - Retirement Plans (Details) - Major Categories of Assets Held By the Plan, Measured At Level 1 Fair Value [Line Items]
Plan asset categories	24	23
Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Note 12 - Retirement Plans (Details) - Major Categories of Assets Held By the Plan, Measured At Level 1 Fair Value [Line Items]
Plan asset categories		402
Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Note 12 - Retirement Plans (Details) - Major Categories of Assets Held By the Plan, Measured At Level 1 Fair Value [Line Items]
Plan asset categories	432
Debt Securities [Member]
Note 12 - Retirement Plans (Details) - Major Categories of Assets Held By the Plan, Measured At Level 1 Fair Value [Line Items]
Plan asset categories	432	402
Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Note 12 - Retirement Plans (Details) - Major Categories of Assets Held By the Plan, Measured At Level 1 Fair Value [Line Items]
Plan asset categories	767	718
Equity Securities [Member]
Note 12 - Retirement Plans (Details) - Major Categories of Assets Held By the Plan, Measured At Level 1 Fair Value [Line Items]
Plan asset categories	767	718
Fair Value, Inputs, Level 1 [Member]
Note 12 - Retirement Plans (Details) - Major Categories of Assets Held By the Plan, Measured At Level 1 Fair Value [Line Items]
Plan asset categories		425
Fair Value, Inputs, Level 2 [Member]
Note 12 - Retirement Plans (Details) - Major Categories of Assets Held By the Plan, Measured At Level 1 Fair Value [Line Items]
Plan asset categories	$ 1,223	$ 718