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Note 13 - Employee and Postretirement Benefit Plans - Plan Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Pension Plan [Member]    
Other assets $ 73
Accrued interest and other liabilities 23
Other Postretirement Benefits Plan [Member]    
Other assets
Accrued interest and other liabilities $ 1,349 $ 1,497