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Note 21 - Related Party Transactions (Details Textual) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Jan. 09, 2018
Oct. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Sep. 19, 2017
Noncontrolling Interest, Increase from Subsidiary Equity Issuance       $ 449  
Net Income (Loss) Attributable to Noncontrolling Interest, Total     $ (7) 964  
Total Investment [Member]          
Investments in Related Parties     17,300 18,600  
General Partner Investments In Hedge And Other Private Funds [Member] | Private Funds [Member]          
Investments in Related Parties     8,600 8,600  
Harvest Capital Credit Corporation [Member]          
Investments in Related Parties     8,700 10,000  
Affiliated Entity [Member]          
Subscription Agreement, Percent Sold 30.00%        
Noncontrolling Interest, Increase from Subsidiary Equity Issuance     500    
Net Income (Loss) Attributable to Noncontrolling Interest, Total     56,000 57,000  
Affiliated Entity [Member] | Management Service, Base [Member]          
Revenue from Related Parties     6,500 12,700  
Affiliated Entity [Member] | Management Service, Incentive [Member]          
Revenue from Related Parties     900 6,400  
Registered Investment Adviser [Member]          
Financing Receivable, after Allowance for Credit Loss, Total     2,400 2,400 $ 3,400
Loans Receivable, Interest Rate         15.00%
Percentage of Loan Sold to Third Party   30.00%      
Value of Loan Sold to Third Party   $ 1,000      
Loans Receivable, Fair Value Disclosure     2,400 $ 2,300  
Consolidated Entity [Member]          
Loans Receivable, Fair Value Disclosure $ 800   $ 800