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Note 1 - Summary of Significant Accounting Policies - Effect of Stranded Tax Effect (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jan. 01, 2019
Dec. 22, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Balance     $ (1,509) $ 1,487 $ (1,831)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]          
Balance   $ 71      
Effect of TCJA 14% Federal Tax Rate Reduction on Gross Deferred Tax Amounts $ 10        
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member]          
Balance   (5,672)      
Effect of TCJA 14% Federal Tax Rate Reduction on Gross Deferred Tax Amounts (794)        
AOCI Attributable to Parent [Member]          
Balance   $ (5,601) (1,509) $ 1,487 $ (1,831)
Effect of TCJA 14% Federal Tax Rate Reduction on Gross Deferred Tax Amounts $ (784)   $ (784)