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Note 10 - Derivative Financial Instruments - Statement of Operations Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Derivative net gain (loss)	$ 7,227	$ 5,324	$ 6,526
Foreign Exchange Forward [Member] | Principal Transactions and Other Income [Member]
Derivative net gain (loss)	0	0	51
Other Extended Settlement Trade [Member] | Principal Transactions and Other Income [Member]
Derivative net gain (loss)	0	0	(70)
TBA and Other Forward MBS [Member] | Net Trading [Member]
Derivative net gain (loss)	7,460	5,219	6,545
Equity Option [Member] | Principal Transactions and Other Income [Member]
Derivative net gain (loss)	$ (233)	$ 105	$ 0

X

- Definition

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5618551-113959

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