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Note 12 - Derivative Instruments and Hedging Activities - Notional or Contractual Amounts and Fair Values of Derivative Financial Instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Aug. 31, 2017
Dec. 31, 2016
Mar. 31, 2015
Feb. 28, 2014
Notional or contractual amount $ 5,813   $ 4,835    
Derivative assets      
Derivative liabilities 90   167    
Interest Rate Swap [Member]          
Notional or contractual amount   $ 1,280   $ 1,200 $ 4,370
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]          
Notional or contractual amount 5,813   4,835    
Derivative assets      
Derivative liabilities $ 90   $ 167