Note 15 - Concentrations of Credit Risk (Details) - Credit Concentration Risk [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Commercial Real Estate Loans [Member]
Note 15 - Concentrations of Credit Risk (Details) [Line Items]
Concentration Risk, Percentage	50.00%	52.00%
Concentration Risk, Credit Risk, Financial Instrument, Maximum Exposure	$ 309,378	$ 310,762
College Housing and Professional Office Buildings [Member]
Note 15 - Concentrations of Credit Risk (Details) [Line Items]
Concentration Risk, Percentage	32.00%	31.00%
Concentration Risk, Credit Risk, Financial Instrument, Maximum Exposure	$ 200,521	$ 190,055
Residential [Member]
Note 15 - Concentrations of Credit Risk (Details) [Line Items]
Concentration Risk, Percentage	23.00%	24.00%
Concentration Risk, Credit Risk, Financial Instrument, Maximum Exposure	$ 143,504	$ 147,039
Automobile [Member]
Note 15 - Concentrations of Credit Risk (Details) [Line Items]
Concentration Risk, Percentage	2.00%	2.00%
Concentration Risk, Credit Risk, Financial Instrument, Maximum Exposure	$ 12,409	$ 11,554