Note 23 - Balance Sheet Offsetting - Financial Instruments That Are Eligible for Offset in the Consolidated Balance Sheet (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Derivative assets, gross	$ 7,810,000	$ 5,218,000
Derivative assets, net	7,810,000	5,218,000
Derivative assets not offset	7,810,000	5,218,000
Derivative liabilities, gross	1,543,000	2,699,000
Derivative liabilities, net	1,543,000	2,699,000
Derivatives, collateral posted	(1,543,000)	(2,699,000)
Securities sold under agreements to repurchase	$ 0	100,000,000
Securities sold under agreements to repurchase, net		100,000,000
Securities sold under agreements to repurchase, collateral posted		$ (100,000,000)