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Note 9 - Debt (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Sep. 27, 2019
Sep. 26, 2019
Jul. 18, 2019
Apr. 30, 2014
Dec. 31, 2019
Dec. 31, 2018
Jan. 09, 2018
Gain (Loss) on Extinguishment of Debt, Total         $ (458) $ (2,838)  
Long-term Line of Credit, Total         22,500  
Letters of Credit Outstanding, Amount         0 1,400  
Notes Payable, Total         6,812 829  
Consolidated Entity [Member]              
Debt Instrument, Interest Rate, Stated Percentage             12.50%
Loans Receivable, Fair Value Disclosure         800   $ 800
Notes Payable, Total         800    
Revolving Credit Conversion to Term Loan Portion to Be Paid in First 2 Years [Member] | CNB [Member]              
Letters of Credit Outstanding, Amount         1,100    
Revolving Credit Conversion to Term Loan Portion to Be Paid in First 2 Years [Member] | CNB [Member] | JMP Securities [Member]              
Line of Credit Facility, Maximum Borrowing Capacity       $ 25,000      
Line of Credit Facility, Revolving Credit Conversion to Term Loan, Repayment, Percent of Funded Debt       3.75%      
Long-term Line of Credit, Total         6,000 0  
Revolving Credit Conversion to Term Loan Portion to Be Paid in First 2 Years [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 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%      
Revolving Credit Facility [Member] | CNB [Member] | JMP Securities [Member]              
Line of Credit Facility, Maximum Borrowing Capacity         20,000    
Long-term Line of Credit, Total         $ 0 0  
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage         0.25%    
The 2019 Senior Notes [Member]              
Proceeds From Bonds   $ 36,000          
Debt Instrument, Interest Rate, Stated Percentage   6.875%          
Senior Notes 2013 [Member]              
Debt Instrument, Interest Rate, Stated Percentage 8.00%            
Extinguishment of Debt, Amount $ 25,000            
Gain (Loss) on Extinguishment of Debt, Total         $ 500    
Interest Expense, Debt, Total         $ 200    
Debt Instrument, Principal Amount Redeemed     $ 11,000        
Debt Instrument, Redemption Price     $ 25        
Senior Notes 2017 [Member]              
Debt Instrument, Interest Rate, Stated Percentage         7.25%    
Senior Notes 2017 and 2019 [Member]              
Debt Instrument, Default, Ownership Percentage         25.00%    
Funding Of Permitted Investments Acquisitions And Working Capital [Member] | Revolving Credit Conversion to Term Loan Portion to Be Paid in First 2 Years [Member] | CNB [Member]              
Line of Credit Facility, Maximum Borrowing Capacity         $ 5,000    
CLO VI Warehouse Facility [Member] | Revolving Credit Facility [Member]              
Long-term Line of Credit, Total         $ 0 $ 22,500  
CLO VI Warehouse Portfolio [Member] | Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]              
Debt Instrument, Basis Spread on Variable Rate         1.25%