Note 9 - Securities Sold Under Agreements to Repurchase (Details Textual) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Securities Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement	$ 34,073	$ 36,370
Short-term Debt [Member]
Securities Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement	32,800	35,100
Long-term Debt [Member]
Securities Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement	$ 1,300	$ 1,300