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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 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Service cost $ 58 $ 45 $ 116 $ 92
Interest cost 93 95 186 191
Amortization of prior service cost 57 56 114 113
Amortization of losses 8 9 15 23
Net periodic cost $ 216 $ 205 $ 431 $ 419