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Note 10 - Employee Benefit Plans - Net Periodic Benefit Cost (Details) - Supplemental Executive Retention Plan [Member] - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Service cost $ 57 $ 46 $ 173 $ 138
Interest cost 93 95 279 286
Amortization of prior service cost 57 57 171 170
Amortization of losses 8 12 23 35
Net periodic cost $ 215 $ 210 $ 646 $ 629