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Note 9 - Derivative Financial Instruments - Balance Sheet Information (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Derivative financial instruments	$ 945	$ 669
TBA and Other Forward MBS [Member] \| Long [Member] \| Investments -Trading [Member]
Derivative financial instruments	6,172	3,686
TBA and Other Forward MBS [Member] \| Short [Member] \| Trading Securities Sold, Not Yet Purchased [Member]
Derivative financial instruments	(5,213)	(3,017)
Other Extended Settlement Trade [Member] \| Long [Member] \| Investments -Trading [Member]
Derivative financial instruments
Other Extended Settlement Trade [Member] \| Short [Member] \| Trading Securities Sold, Not Yet Purchased [Member]
Derivative financial instruments	(14)
Foreign Exchange Forward [Member] \| Other Investments [Member]
Derivative financial instruments