Note 5 - Commitments and Contingencies (Details Textual) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Unused Commitments to Extend Credit	$ 118,200	$ 126,900
Construction Loan Payable [Member]
Unused Commitments to Extend Credit	22,000
Standby Letters of Credit [Member]
Unused Commitments to Extend Credit	$ 417	$ 417