Note 8 - Derivatives Instruments and Hedging Activities (Details) (USD $)	9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
Note 8 - Derivatives Instruments and Hedging Activities (Details) [Line Items]
Derivative Liability	$ 419,000	$ 1,432,000
Derivative Assets (Liabilities), at Fair Value, Net	300,000	300,000
Derivative, Net Liability Position, Aggregate Fair Value	2,100,000	2,300,000
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred	1,500,000
Restricted Cash and Cash Equivalents	63,800,000	44,100,000
Eurodollar Future [Member]
Note 8 - Derivatives Instruments and Hedging Activities (Details) [Line Items]
Derivative, Number of Instruments Held	2,778
TBA [Member]
Note 8 - Derivatives Instruments and Hedging Activities (Details) [Line Items]
Derivative Liability	215,400,000	191,600,000
Interest Rate Swap [Member]
Note 8 - Derivatives Instruments and Hedging Activities (Details) [Line Items]
Restricted Cash and Cash Equivalents	$ 12,700,000	$ 10,200,000