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Note 8 - Derivative Financial Instruments (Details Textual)
3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
Sep. 30, 2017
USD ($)
Minimum Number of Broker/Dealer Counterparties To Adequately Spread the Credit Risk of Non-Performing Over-The-Counter Derivative Financial Instruments 3 3
Number of Derivative Counterparties Entered Into Agreements During the Period   3
Three Derivative Counterparties [Member]    
Restricted Cash $ 0 $ 0
Not Designated as Hedging Instrument [Member] | Gain On Sale of Loans [Member]    
Derivative, Gain on Derivative 260,000 260,000
Interest Rate Lock Commitments [Member] | Not Designated as Hedging Instrument [Member]    
Derivative Asset 235,000 235,000
Interest Rate Lock Commitments [Member] | Not Designated as Hedging Instrument [Member] | Gain On Sale of Loans [Member]    
Derivative, Gain on Derivative 235,000 235,000
Forward Contracts [Member] | Not Designated as Hedging Instrument [Member] | Commercial Mortgage Backed Securities [Member]    
Derivative Asset, Fair Value, Gross Asset 21,000 21,000
Derivative Asset, Notional Amount 12,200,000 12,200,000
Forward Contracts [Member] | Not Designated as Hedging Instrument [Member] | Commercial Mortgage Backed Securities [Member] | Three Derivative Counterparties [Member]    
Derivative, Gain on Derivative   24,000
Forward Contracts [Member] | Not Designated as Hedging Instrument [Member] | Commercial Mortgage Backed Securities [Member] | Gain On Sale of Loans [Member]    
Derivative, Gain on Derivative $ 24,000 $ 24,000