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Note 21 - Revenue From Contracts With Customers (Details Textual) - USD ($)
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Mar. 31, 2021
Dec. 31, 2020
Trading Activity Charges Reducing Product Sales Commissions and Fees $ 289,000 $ 283,000    
Contract with Customer, Asset, after Allowance for Credit Loss, Total     $ 0  
Fiduciary and Trust [Member]        
Accrued Fees and Other Revenue Receivable $ 2,600,000     $ 2,200,000