Note 5 - Loans - TDRs with Subsequent Default (Details)
12 Months Ended
Dec. 31, 2016
USD ($)
Number of Contracts 4
Recorded Investment $ 787
Number of Contracts 4
Residential Portfolio Segment [Member]  
Number of Contracts 3
Recorded Investment $ 107,000
Number of Contracts 3
Commercial Real Estate Portfolio Segment [Member]  
Number of Contracts 1
Recorded Investment $ 680,000
Number of Contracts 1
Construction, Land Acquisition and Development [Member]  
Number of Contracts
Recorded Investment
Number of Contracts
Commercial and Industrial [Member]  
Number of Contracts
Recorded Investment
Number of Contracts
Consumer Portfolio Segment [Member]  
Number of Contracts
Recorded Investment
Number of Contracts
State and Political Subdivisions [Member]  
Number of Contracts
Recorded Investment
Number of Contracts