Note 11 - Other Borrowings and Unused Lines of Credit - Other Borrowings (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Other borrowings	$ 66,000,000	$ 80,000,000
Revolving Credit Facility [Member]
Other borrowings		5,000,000
Whole sale Repurchase Agreements [Member]
Other borrowings	35,000,000	45,000,000
Term Note [Member]
Other borrowings	$ 31,000,000	$ 30,000,000