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Note 5 - Premises and Equipment, Net (Details Textual) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Operating Leases, Future Minimum Payments Due $ 1.0    
Operating Leases, Future Minimum Payments Due, Next Twelve Months 0.4    
Operating Leases, Future Minimum Payments Due in One to Three Years 0.4    
Operating Leases, Future Minimum Payments Due in Three to Five Years 0.2    
Depreciation $ 2.9 $ 3.0 $ 2.3