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Note 21 - Equity - Rollforward of Units Outstanding (Details) - shares
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Issuance of Units (in shares) 3,417,310 402,350 410,820
Issuance of Units for purchase of IMXI (in shares)     22,429,541
Additional units purchased by Daniel G. Cohen (in shares)     0
Issuance of Units as equity compensation (in shares) 0 0 0
Repurchase and retirement of common stock (in shares) (495,440) (1,211,810) (318,900)
Vesting of units (in shares) 529,050 275,000  
Balance, shares (in shares) 41,869,175 38,418,255 38,952,715
Cohen & Company [Member]      
Issuance of Units (in shares) 3,417,310 402,350 410,820
Issuance of Units for purchase of IMXI (in shares)     0
Additional units purchased by Daniel G. Cohen (in shares)     0
Issuance of Units as equity compensation (in shares) 0 0 0
Repurchase and retirement of common stock (in shares) (495,440) (1,211,810) (318,900)
Vesting of units (in shares) 0 0  
Balance, shares (in shares) 13,311,494 10,389,624 11,199,084
Daniel G. Cohen [Member]      
Issuance of Units (in shares) 0 0 0
Issuance of Units for purchase of IMXI (in shares)     12,549,273
Additional units purchased by Daniel G. Cohen (in shares)     268,445
Issuance of Units as equity compensation (in shares) 0 0 0
Repurchase and retirement of common stock (in shares) 0 0 0
Vesting of units (in shares) 529,040 275,000  
Balance, shares (in shares) 18,605,315 18,076,275 17,801,275
DGC Trust [Member]      
Issuance of Units (in shares) 0 0 0
Issuance of Units for purchase of IMXI (in shares)     9,880,268
Additional units purchased by Daniel G. Cohen (in shares)     0
Issuance of Units as equity compensation (in shares) 0 0 0
Repurchase and retirement of common stock (in shares) 0 0 0
Vesting of units (in shares) 0 0  
Balance, shares (in shares) 9,880,268 9,880,268 9,880,268
Others [Member]      
Issuance of Units (in shares) 0 0 0
Issuance of Units for purchase of IMXI (in shares)     0
Additional units purchased by Daniel G. Cohen (in shares)     (268,445)
Issuance of Units as equity compensation (in shares) 0 0 0
Repurchase and retirement of common stock (in shares) 0 0 0
Vesting of units (in shares) 10 0  
Balance, shares (in shares) 72,098 72,088 72,088