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Note 3 - Acquisitions (Details Textual)
 3 Months Ended 12 Months Ended
Aug. 01, 2015
USD ($)
Oct. 01, 2014
USD ($)
Aug. 01, 2013
USD ($)
Dec. 31, 2015
USD ($)
Sep. 30, 2015
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
CHP [Member]                  
Payments to Acquire Businesses, Net of Cash Acquired $ 74,570,000                
Business Acquisition, Purchase Price Allocation, Intangible Assets Including Goodwill 81,726,000                
Goodwill $ 30,076,000                
Increase (Decrease) in Intangible Assets, Non-current       $ (6,552,000)          
Goodwill, Period Increase (Decrease)       6,208,000          
Noncash or Part Noncash Acquisition, Debt Assumed       12,000,000          
MAC Inc. [Member]                  
Payments to Acquire Businesses, Net of Cash Acquired   $ 55,035,000              
Business Acquisition, Purchase Price Allocation, Intangible Assets Including Goodwill   49,378,000              
Goodwill   $ 25,898,000              
Increase (Decrease) in Intangible Assets, Non-current         $ (4,229,000)        
Goodwill, Period Increase (Decrease)         $ 2,481,000        
Tower Light [Member]                  
Payments to Acquire Businesses, Net of Cash Acquired     $ 80,239,000            
Business Acquisition, Purchase Price Allocation, Intangible Assets Including Goodwill     67,900,000            
Goodwill     38,400,000            
Goodwill, Period Increase (Decrease)           $ 9,328,000      
Business Combination, Consideration Transferred     $ 85,812,000            
Number of Countries in Which Subsidiary of Entity Has Distribution Network     50            
Restricted Cash and Cash Equivalents     $ 6,645,000            
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Consideration Transferred               $ 7,641,000  
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability               (4,877,000)  
Payments to Acquire Businesses, Net of Cash Acquired             $ 73,782,000 61,196,000 $ 116,113,000
Goodwill       $ 669,719,000   $ 608,287,000 $ 669,719,000 635,565,000 $ 608,287,000
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability             $ (4,877,000)