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Note 6 - Debt (Details Textual) - USD ($)
$ in Thousands
3 Months Ended
Aug. 03, 2016
Mar. 31, 2019
Dec. 31, 2018
Jan. 09, 2018
Senior Notes, Total   $ 83,600 $ 83,497  
Long-term Line of Credit, Total   22,500  
Notes Payable, Total   829 829  
Consolidated Entity [Member]        
Debt Instrument, Interest Rate, Stated Percentage       12.50%
Loans Receivable, Fair Value Disclosure   800   $ 800
Notes Payable, Total   $ 800    
Revolving Credit Facility [Member] | CNB [Member] | JMP Securities [Member]        
Line of Credit Facility, Maximum Borrowing Capacity $ 25,000   20,000  
Revolving Credit Facility [Member] | CNB [Member] | JMP Securities [Member] | London Interbank Offered Rate (LIBOR) [Member]        
Debt Instrument, Basis Spread on Variable Rate 2.25%      
Revolving Credit Conversion to Term Loan Portion to Be Paid in First 2 Years [Member] | CNB [Member] | JMP Securities [Member]        
Line of Credit Facility, Revolving Credit Conversion to Term Loan, Repayment, Percent of Funded Debt 3.75%      
Revolving Credit Conversion to Term Loan Portion to Be Paid in Next 2 Years Member | CNB [Member] | JMP Securities [Member]        
Line of Credit Facility, Revolving Credit Conversion to Term Loan, Repayment, Percent of Funded Debt 5.00%      
Senior Notes 2023 [Member]        
Debt Instrument, Interest Rate, Stated Percentage   8.00%    
Senior Notes, Total   $ 36,000    
Senior Notes 2027 [Member]        
Debt Instrument, Interest Rate, Stated Percentage   7.25%    
Senior Notes 2023 and 2027 [Member]        
Debt Instrument, Default, Ownership Percentage   25.00%    
CLO VI Warehouse Facility [Member] | Revolving Credit Facility [Member]        
Debt Instrument, Collateral Amount   $ 0 $ 26,000  
Long-term Line of Credit, Total   $ 0    
CLO VI Warehouse Portfolio [Member] | Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]        
Debt Instrument, Basis Spread on Variable Rate   1.25%