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Note 7 - Debt Securities (Details Textual) - USD ($)
Jun. 30, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale, Restricted $ 197,100,000 $ 180,000,000.0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax $ 162,000 $ 448,000