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Note 14 - Retirement Benefit Plans - Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Service benefit $ (311) $ (153) $ (202)
Interest cost 95 108 106
Amortization of unrecognized transition obligation 61 61 61
Net periodic (benefit) cost (155) 16 (35)
Amortization of unrecognized transition obligation, net of tax (34) (36) (36)
Total recognized in net periodic (benefit) cost and accumulated other comprehensive income $ (189) $ (20) $ (71)