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Note 18 - Related Party Transactions (Details Textual) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Jan. 09, 2018
Oct. 31, 2017
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Sep. 19, 2017
Noncontrolling Interest, Increase from Subsidiary Equity Issuance       $ 446    
Net Income (Loss) Attributable to Noncontrolling Interest, Total     $ 70 (1,464)    
Total Investment [Member]            
Investments in Related Parties     22,500   $ 18,600  
General Partner Investments In Hedge And Other Private Funds [Member] | Private Funds [Member]            
Investments in Related Parties     12,200   8,600  
Harvest Capital Credit Corporation [Member]            
Investments in Related Parties     10,300   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     15   57  
Affiliated Entity [Member] | Management Service, Base [Member]            
Revenue from Related Parties     1,700 3,100    
Affiliated Entity [Member] | Management Service, Incentive [Member]            
Revenue from Related Parties     0 $ 3,400    
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