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Note 12 - Contingencies (Details Textual)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2016
USD ($)
mi
Dec. 31, 2008
USD ($)
Dec. 31, 2003
USD ($)
Dec. 31, 2015
USD ($)
Newark Bay Complex Litigation [Member]        
Accrual for Environmental Loss Contingencies $ 0      
Site Contingency Clean Up Plan, Miles of Clean Up (in miles) | mi 8.3      
Amount of Estimated Cost to Clean Up Site that the Company is Not Exposed $ 1,380,000      
Bayonne [Member]        
Accrual for Environmental Loss Contingencies 597      
Accrual for Environmental Loss Contingencies, Period Increase (Decrease) 200      
Clifton and Calstadt [Member]        
Accrual for Environmental Loss Contingencies 2,128      
Accrual for Environmental Loss Contingencies, Period Increase (Decrease) 35      
Berrys Creek Site [Member]        
Accrual for Environmental Loss Contingencies 189      
Accrual for Environmental Loss Contingencies, Period Increase (Decrease) $ 213      
Number of Subsidiaries Notice Received 2      
Maybrook Site [Member]        
Accrual for Environmental Loss Contingencies $ 322      
Harriman Site [Member] | Minimum [Member]        
Site Contingency Loss Exposure, Estimated Range 2,000      
Harriman Site [Member] | Maximum [Member]        
Site Contingency Loss Exposure, Estimated Range 7,000      
Harriman Site [Member]        
Accrual for Environmental Loss Contingencies 3,565      
Scientific Chemical Processing SCP Superfund Site [Member]        
Accrual for Environmental Loss Contingencies $ 934      
Number of Other Sites Named PRP of SCP Superfund Site 130      
Site Contingency, Recovery from Third Party of Environmental Remediation Cost $ 598      
Lorazepam and Clorazepate [Member] | Indemnification Agreement [Member]        
Payment in Exchange for Release and Full Indemnity Against Future Cost or Liabilities     $ 12,415  
Lorazepam and Clorazepate [Member]        
Loss Contingency, Number of Plaintiffs   4    
Judgment Amount Against Parties Payable Jointly and Severally   $ 19,200    
Loss Contingency, Damages Awarded, Value   16,709    
Loss Contingency, Prejudgment Interest   $ 7,500    
Pending Increase (Decrease) in Damages Award Value (9,600)      
Accrual for Environmental Loss Contingencies 8,485     $ 8,329
Accrual for Environmental Loss Contingencies, Period Increase (Decrease) 610      
Accrual for Environmental Loss Contingencies, Payments $ 454