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Note 11 - Contingencies (Details Textual)
$ in Thousands
1 Months Ended 9 Months Ended 12 Months Ended
May 30, 2017
USD ($)
Sep. 30, 2017
USD ($)
mi²
Dec. 31, 2008
Dec. 31, 2003
USD ($)
Dec. 31, 2016
USD ($)
Accrual for Environmental Loss Contingencies   $ 17,434     $ 16,703
Accrual for Environmental Loss Contingencies, Period Increase (Decrease)   2,419      
Accrual for Environmental Loss Contingencies, Payments   1,688      
Lorazepam and Clorazepate [Member]          
Loss Contingency, Number of Plaintiffs     4    
Judgment Amount Against Parties Payable Jointly and Severally   67,260      
Lorazepam and Clorazepate [Member] | Indemnification Agreement [Member]          
Payment in Exchange for Release and Full Indemnity Against Future Cost or Liabilities       $ 12,415  
Bayonne [Member]          
Accrual for Environmental Loss Contingencies   450      
Clifton and Carlstadt [Member]          
Accrual for Environmental Loss Contingencies   1,889      
Berrys Creek Site [Member]          
Accrual for Environmental Loss Contingencies   $ 9,829      
Number of Subsidiaries Notice Received   2      
Environmental Exit Costs, Reasonably Possible Losses, Estimated Share   2.40%      
Maybrook Site [Member]          
Accrual for Environmental Loss Contingencies   $ 329      
Accrual for Environmental Loss Contingencies, Payments $ 363        
Harriman Site [Member]          
Accrual for Environmental Loss Contingencies   3,465      
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      
Scientific Chemical Processing SCP Superfund Site [Member]          
Accrual for Environmental Loss Contingencies   $ 762      
Number of Other Sites Named PRP of SCP Superfund Site   130      
Site Contingency, Recovery from Third Party of Environmental Remediation Cost   $ 488      
Newark Bay Complex Litigation [Member]          
Accrual for Environmental Loss Contingencies   $ 0      
Site Contingency Clean Up Plan, Miles of Clean Up | mi²   8.3      
Amount of Estimated Cost to Clean Up Site that the Company is Not Exposed   $ 1,380,000      
Other Noncurrent Liabilities [Member]          
Accrual for Environmental Loss Contingencies   $ 16,881     $ 15,441