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Note 4 - Comprehensive Income - Amounts Reclassified Out of Each Component of OCI (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Income tax provision $ 816 $ 981
Net income (4,166) (5,090)
Reclassification out of Accumulated Other Comprehensive Income [Member]    
Net income (6) (6)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]    
Prior service cost (8) (8)
Reclassification out of Accumulated Other Comprehensive Income [Member] | AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]    
Income tax provision $ 2 $ 2