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Note 5 - Comprehensive Income - Amounts Reclassified Out of Each Component of OCI (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Income tax provision $ 1,135 $ 1,096 $ 693 $ 981 $ 1,021 $ 1,111 $ 1,377 $ 741 $ 3,905 $ 4,250
Net income (5,458) (5,307) (3,649) (5,090) (5,681) (5,586) (6,371) (4,375) (19,504) (22,013)
Total before tax 6,593 6,403 4,342 6,071 6,702 6,697 7,748 5,116 23,409 26,263
Total before tax $ (6,593) $ (6,403) $ (4,342) $ (6,071) $ (6,702) $ (6,697) $ (7,748) $ (5,116) (23,409) (26,263)
Reclassification out of Accumulated Other Comprehensive Income [Member]                    
Net income                 (43) 214
Reclassification out of Accumulated Other Comprehensive Income [Member] | AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]                    
Total before tax                 (23)  
Income tax provision                 5 (60)
Net income                 (18) 228
Total before tax                   (288)
Total before tax                   288
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]                    
Income tax provision                 7 3
Net income                 (25) (14)
Amortization of prior service cost                 (31) (30)
Actuarial (gain) loss                 (1) 13
Total before tax                 (32) (17)
Total before tax                 $ 32 $ 17