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Note 12 - Pension and Other Postretirement Benefit Plans (Details) - The Following Benefit Payments Under the Directors’ Plan, Which Reflect Expected Future Service, are Expected to be Paid - Directors' Plan [Member]
$ in Thousands
Dec. 31, 2015
USD ($)
Note 12 - Pension and Other Postretirement Benefit Plans (Details) - The Following Benefit Payments Under the Directors’ Plan, Which Reflect Expected Future Service, are Expected to be Paid [Line Items]  
2016 $ 288
2017 288
2018 272
2019 288
2020 288
2021 – 2025 $ 1,244