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Note 9 - Income Taxes Income Tax (Details) $ in Millions | Mar. 31, 2018 USD ($)
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Operating Loss Carryforwards [Line Items] |
Operating Loss Carryforwards | $ 8.4
Operating Loss Carryforwards Due to Acquisitions | 2.3
Deferred Tax Assets, Tax Credit Carryforwards, Research | 6.8
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax | 57.1
State and Local NOL Carryforwards [Member] |
Operating Loss Carryforwards [Line Items] |
Valuation Allowance, Amount | $ 64.4

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