Note 7 - Fair Value of Financial Instruments (Details Textual) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Interest and Fees [Member]
Interest and Fee Income, Loans Held-for-sale, Mortgages	$ 89,000		$ 89,000
SBA Servicing Assets [Member]
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 10 Percent Adverse Change in Key Assumptions, Percent	10.00%		10.00%		10.00%
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 20 Percent Adverse Change in Key Assumptions	20.00%		20.00%		20.00%
Servicing Fees	$ 458,000	$ 447,000	$ 1,300,000	$ 1,300,000
Loans Held-for-sale, Write-down	$ 0				$ 0