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Note 3 - Income Taxes (Details Textual) $ in Millions | Sep. 30, 2020 USD ($)
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Deferred Tax Liabilities, Net, Total | $ 126.1
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] |
Deferred Tax Liabilities, Net, Total | 34.9
Foreign Tax Authority [Member] | Canada Revenue Agency [Member] |
Deferred Tax Liabilities, Net, Total | 94.6
Foreign Tax Authority [Member] | Mexican Tax Authority [Member] |
Deferred Tax Assets, Net of Valuation Allowance, Total | $ 3.4

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