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Note 2 - Adoption of New Accounting Standard (Details Textual) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 USD ($) | Jan. 01, 2018 USD ($)
Cumulative Effect of New Accounting Principle in Period of Adoption | $ 485,000 |
Number of Reportable Segments | 4 |
Retained Earnings [Member] |  |
Cumulative Effect of New Accounting Principle in Period of Adoption | $ 485,000 |
Accounting Standards Update 2014-09 [Member] | Retained Earnings [Member] |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  | $ 485,000

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