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Note 3 - Recent Accounting Pronouncements (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Jan. 01, 2020 | Dec. 31, 2019
Retained Earnings (Accumulated Deficit), Ending Balance | $ 1,710,994 |  |  | $ 1,710,994 |  |  | $ 1,659,153
Provision for Loan and Lease Losses, Total | 25,000 | $ 25,000 | $ 0 | $ 50,000 | $ 0 |  |
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] | Minimum [Member] |  |  |  |  |  |  |
Retained Earnings (Accumulated Deficit), Ending Balance |  |  |  |  |  | $ 10,000 |
Accounts Receivable, Allowance for Credit Loss, Ending Balance |  |  |  |  |  | 15,000 |
Accounts Receivable, Credit Loss Expense (Reversal) | 5,000 | 10,000 |  |  |  |  |
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] | Maximum [Member] |  |  |  |  |  |  |
Retained Earnings (Accumulated Deficit), Ending Balance |  |  |  |  |  | 12,000 |
Accounts Receivable, Allowance for Credit Loss, Ending Balance |  |  |  |  |  | $ 17,000 |
Accounts Receivable, Credit Loss Expense (Reversal) | $ 10,000 | $ 15,000 |  |  |  |  |

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