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Note 20 - New Authoritative Accounting Pronouncements (Details Textual) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Jan. 01, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  | 21.00% | 35.00% | 35.00%
Stranded Tax Effects from Accounting Standards Update, Balance Sheet Impact |  |  | $ 2.1 |  |
Accounting Standards Update 2016-01 [Member] |  |  |  |  |
Cumulative Effect on Retained Earnings, Net of Tax, Total | $ (0.8) |  |  |  |
Accounting Standards Update 2016-02 [Member] | Scenario, Forecast [Member] | Minimum [Member] |  |  |  |  |
Operating Lease, Liability, Total |  | $ 40.0 |  |  |
Increase (Decrease) in Regulatory Capital Ratios |  | (0.01%) |  |  |
Operating Lease, Right-of-Use Asset |  | $ 40.0 |  |  |
Accounting Standards Update 2016-02 [Member] | Scenario, Forecast [Member] | Maximum [Member] |  |  |  |  |
Operating Lease, Liability, Total |  | $ 50.0 |  |  |
Increase (Decrease) in Regulatory Capital Ratios |  | (0.06%) |  |  |
Operating Lease, Right-of-Use Asset |  | $ 50.0 |  |  |

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