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Note 21 - Equity - Rollforward of Units Outstanding (Details) - shares
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Issuance of Units (in shares) 402,350 410,820 247,120  
Repurchase and retirement of common stock (in shares) (1,211,810) (318,900) (750,810)  
Issuance of Units for purchase of IMXI (in shares)   22,429,541    
Additional units purchased by Daniel G. Cohen (in shares) 275,000    
Balance, shares (in shares) 38,418,255 38,952,715 16,431,254  
Issuance of Units as equity compensation (in shares)      
Balance, shares (in shares) 38,418,255 38,952,715 16,431,254 16,934,944
Cohen & Company [Member]        
Issuance of Units (in shares) 402,350 410,820 247,120  
Repurchase and retirement of common stock (in shares) (1,211,810) (318,900) (750,810)  
Issuance of Units for purchase of IMXI (in shares)      
Additional units purchased by Daniel G. Cohen (in shares)    
Balance, shares (in shares) 10,389,624 11,199,084 11,107,164  
Issuance of Units as equity compensation (in shares)      
Balance, shares (in shares) 10,389,624 11,199,084 11,107,164 11,610,854
Daniel G. Cohen [Member]        
Issuance of Units (in shares)  
Repurchase and retirement of common stock (in shares)  
Issuance of Units for purchase of IMXI (in shares)   12,549,273    
Additional units purchased by Daniel G. Cohen (in shares) 275,000 268,445    
Balance, shares (in shares) 18,076,275 17,801,275 4,983,557  
Issuance of Units as equity compensation (in shares)      
Balance, shares (in shares) 18,076,275 17,801,275 4,983,557 4,983,557
DGC Trust [Member]        
Issuance of Units (in shares)  
Repurchase and retirement of common stock (in shares)  
Issuance of Units for purchase of IMXI (in shares)   9,880,268    
Additional units purchased by Daniel G. Cohen (in shares)    
Balance, shares (in shares) 9,880,268 9,880,268  
Issuance of Units as equity compensation (in shares)      
Balance, shares (in shares) 9,880,268 9,880,268
Others [Member]        
Issuance of Units (in shares)  
Repurchase and retirement of common stock (in shares)  
Issuance of Units for purchase of IMXI (in shares)      
Additional units purchased by Daniel G. Cohen (in shares) (268,445)    
Balance, shares (in shares) 72,088 72,088 340,533  
Issuance of Units as equity compensation (in shares)      
Balance, shares (in shares) 72,088 72,088 340,533 340,533