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Note 3 - Income Taxes (Details Textual) $ in Millions | Mar. 31, 2020 USD ($)
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Deferred Tax Liabilities, Net, Total | $ 123.2
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] |
Deferred Tax Liabilities, Net, Total | 37.0
Foreign Tax Authority [Member] | Canada Revenue Agency [Member] |
Deferred Tax Liabilities, Net, Total | 89.2
Foreign Tax Authority [Member] | Mexican Tax Authority [Member] |
Deferred Tax Liabilities, Net, Total | $ 3.0

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