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Note 8 - Financial Instruments - Trading Securities Sold, Not Yet Purchased (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Investment securities sold, not yet purchased $ 44,439 $ 77,947
Other investment sold, not yet repurchased, cost 7,561  
Other investments sold, not yet purchased 7,415
Other investment sold, not yet repurchased, unrealized gain (loss) 146  
Derivative [Member]    
Investment securities sold, not yet purchased 11,822 3,017
Other investment sold, not yet repurchased, cost 338  
Other investments sold, not yet purchased 233  
Other investment sold, not yet repurchased, unrealized gain (loss) 105  
Corporate Bonds and Redeemable Preferred Stock [Member]    
Investment securities sold, not yet purchased 29,206 58,083
Equity Securities [Member]    
Investment securities sold, not yet purchased 43
Other investment sold, not yet repurchased, cost 7,223  
Other investments sold, not yet purchased 7,182  
Other investment sold, not yet repurchased, unrealized gain (loss) 41  
Municipal Bonds [Member]    
Investment securities sold, not yet purchased 20 20
US Treasury Securities [Member]    
Investment securities sold, not yet purchased $ 3,348 $ 16,827