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Note 6 - Loans Held for Sale (Details Textual)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
Dec. 31, 2015
Performing Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member]      
Number of Loans Held for Sale 1    
Proceeds from Sale of Loans Held-for-sale $ 3,000,000    
Gain (Loss) on Sale of Loans and Leases $ 30,000    
Performing Financial Instruments [Member] | Small Business Administration Portfolio Segment [Member]      
Number of Loans Held for Sale 4 6  
Proceeds from Sale of Loans Held-for-sale $ 3,800,000 $ 3,500,000  
Gain (Loss) on Sale of Loans and Leases $ 300,000 $ 300,000  
Number of Loans Held for Sale   0 0