Note 6 - Premises and Equipment (Details Textual) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Depreciation $ 1,574,249 $ 1,657,229 $ 1,595,253
Operating Leases, Rent Expense, Net $ 437,000 $ 560,000 $ 613,000