Note 8 - Commitments and Off-balance Sheet Risk (Details Textual) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Reserve or Liability Balance for Financial Instruments With Off Balance Sheet Risk	$ 0	$ 0
Minimum [Member]
Fees Accreted Into Income During Interest Rate Swap Agreements Term	4 years
Maximum [Member]
Fees Accreted Into Income During Interest Rate Swap Agreements Term	15 years