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Note 10 - Credit Agreements (Details Textual)
$ in Thousands
 1 Months Ended 3 Months Ended 7 Months Ended 12 Months Ended
Apr. 30, 2017
Jul. 01, 2016
Jul. 01, 2015
Dec. 31, 2017
USD ($)
Nov. 30, 2016
USD ($)
May 31, 2015
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Nov. 30, 2017
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Jun. 30, 2017
USD ($)
May 31, 2013
USD ($)
Net Debt Leverage Ratio Threshold               2.5                
Gain Loss on Change in Cash Flows Related to Debt                       $ (2,957) [1] $ (2,381) [1]    
Gain (Loss) on Extinguishment of Debt                       (574) [2] $ (4,795) [2]    
Short-term Debt       $ 20,602       $ 20,602       20,602 $ 31,198      
ABL Revolving Credit Facility [Member]                                
Line of Credit Facility, Maximum Borrowing Capacity           $ 150,000                    
Uncommitted Incremental Term Loan Facility           50,000                    
Amended ABL Facility [Member]                                
Line of Credit Facility, Maximum Borrowing Capacity           250,000                    
Uncommitted Incremental Term Loan Facility           $ 100,000                    
Debt Instrument, Basis Spread on Variable Rate           (0.50%)                    
Debt Issuance Costs, Net           $ 540                    
Line of Credit Facility, Unused Capacity, Decrease In Commitment Fee Percentage           0.125%                    
Proceeds from Lines of Credit           $ 100,000                    
Line of Credit Facility, Remaining Borrowing Capacity       $ 249,650       249,650       $ 249,650        
Base Rate [Member] | ABL Revolving Credit Facility [Member]                                
Debt Instrument, Basis Spread on Variable Rate           1.00%                    
Adjusted LIBOR Rate [Member] | ABL Revolving Credit Facility [Member]                                
Debt Instrument, Basis Spread on Variable Rate           2.00%                    
Term Loan [Member]                                
Line of Credit Facility, Maximum Borrowing Capacity                               $ 1,200,000
Uncommitted Incremental Term Loan Facility                               $ 300,000
Net Debt Leverage Ratio Threshold       3.75         3 3   3        
Net Debt Leverage Ratio Not Achieved                         3 3    
Debt Instrument, Interest Rate, Increase (Decrease)                   0.25%     0.25% 0.25%    
Gain Loss on Change in Cash Flows Related to Debt                 $ (2,957) $ (2,381)            
Debt Issuance Costs, Net       $ 2,346 $ 4,242 $ 1,528   2,346       $ 2,346     $ 1,432  
Debt Instrument, Fee Amount       $ 38 315 49   $ 38       $ 38     $ 85  
Repayments of Long-term Debt         $ 25,000 $ 100,000 $ 50,000                  
Gain (Loss) on Extinguishment of Debt                         $ (574) $ (4,795)    
Term Loan [Member] | Net Debt Leverage Ratio Threshold Not Achieved [Member]                                
Net Debt Leverage Ratio Not Achieved   3 3                          
Term Loan [Member] | Base Rate [Member]                                
Debt Instrument, Basis Spread on Variable Rate 1.75%                   1.25% 1.00%        
Term Loan [Member] | Base Rate [Member] | Net Debt Leverage Ratio Threshold [Member]                                
Debt Instrument, Basis Spread on Variable Rate 1.50%                              
Term Loan [Member] | Adjusted LIBOR Rate [Member]                                
Debt Instrument, Basis Spread on Variable Rate 2.75%                   2.25% 2.00%        
Term Loan [Member] | Adjusted LIBOR Rate [Member] | Net Debt Leverage Ratio Threshold [Member]                                
Debt Instrument, Basis Spread on Variable Rate 2.50%                              
Term Loan [Member] | LIBOR Floor Rate [Member]                                
Debt Instrument, Basis Spread on Variable Rate 0.75%                   0.75%          
[1] For the year ended December 31, 2016, represents a non-cash loss relating to the continued 25 basis point increase in borrowing costs as a result of the credit agreement leverage ratio remaining above 3.0 times based on projections at that time. For the year ended December 31, 2015, represents a non-cash loss relating to a 25 basis point increase in borrowing costs as a result of the credit agreement leverage ratio rising above 3.0 times and expected to remain above 3.0 times based on projections at that time. Following the May 2017 Term Loan amendment, which removed the pricing grid based on leverage ratio achieved, gains or losses on changes in contractual interest rate will no longer be recorded in the statements of comprehensive income. Refer to Note 10, "Credit Agreements," to the consolidated financial statements in Item 8 of this Annual Report on Form 10-K for further information on the gains and losses on changes in the contractual interest rate.
[2] Represents the write-off of original issue discount and capitalized debt issuance costs due to voluntary debt prepayments.