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Note 5 - Long-term Debt, Net (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 9 Months Ended
Jul. 01, 2021
Mar. 31, 2021
Jul. 01, 2020
Sep. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Jun. 30, 2021
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Jul. 01, 2019
Gain (Loss) on Extinguishment of Debt, Total       $ 0   $ 0   $ (2,964) $ 0    
Long-term Debt, Total       46,507       46,507   $ 40,576  
Repayments of Long-term Debt, Total               45,486 $ 10,925    
The Credit Agreement [Member]                      
Debt Instrument, LIBOR Floor   0.25%                  
Debt Instrument, Interest Rate, Effective Percentage   2.50%     2.50%            
The Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member]                      
Debt Instrument, Basis Spread on Variable Rate   2.25%                  
The Credit Agreement [Member] | Minimum [Member] | Base Rate [Member]                      
Debt Instrument, Basis Spread on Variable Rate   0.75%                  
The Credit Agreement [Member] | Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member]                      
Debt Instrument, Basis Spread on Variable Rate   1.75%                  
The Credit Agreement [Member] | Maximum [Member] | Base Rate [Member]                      
Debt Instrument, Basis Spread on Variable Rate   1.75%                  
The Credit Agreement [Member] | Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member]                      
Debt Instrument, Basis Spread on Variable Rate   2.75%                  
The Credit Agreement [Member] | Revolving Credit Facility [Member]                      
Line of Credit Facility, Maximum Borrowing Capacity   $ 15,000     $ 15,000            
Promissory Notes [Member]                      
Long-term Debt, Total       0       0   1,226  
Debt Instrument, Unamortized Discount, Total       0       0   24  
Promissory Notes [Member] | Asset Purchase Agreement [Member]                      
Debt Instrument, Interest Rate, Effective Percentage                     4.28%
Long-term Debt, Total                     $ 2,350
Debt Instrument, Unamortized Discount, Total                     $ 150
Repayments of Long-term Debt, Total $ 1,250   $ 1,250                
The Refinanced Term Loan [Member]                      
Extinguishment of Debt, Amount         38,318            
Gain (Loss) on Extinguishment of Debt, Total         (2,964)            
New Credit Facility Term Loan [Member] | The Credit Agreement [Member]                      
Debt Instrument, Face Amount   $ 50,000     $ 50,000            
Debt Instrument, Quarterly Principal Amortization             $ 1,250        
Long-term Debt, Total       46,507       46,507   0  
Debt Instrument, Unamortized Discount, Total       $ 993       $ 993   $ 0