Note 5 - Commitments and Contingencies (Details Textual) - USD ($)	Jun. 30, 2017	Dec. 31, 2016
Unused Commitments to Extend Credit	$ 93,600,000	$ 93,700,000
Construction Loan Payable [Member]
Unused Commitments to Extend Credit	10,075,000
Standby Letters of Credit [Member]
Unused Commitments to Extend Credit	$ 100,000	$ 625,000