Note 8 - Repurchase Agreements (Details Textual) - USD ($)	3 Months Ended	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Securities Loaned or Sold under Agreements to Repurchase [Member]
Repayments of Long-term Debt	$ 38,000,000
Debt, Average Cost, Percentage	4.16	$ 4.16
Payments of Debt Extinguishment Costs	2,100,000
Securities Sold under Agreements to Repurchase, Fair Value of Collateral	$ 67,900,000	67,900,000		$ 131,400,000
Repayments of Long-term Debt		$ 190,637,000	$ 50,000,000