Note 21 - Contingencies (Details Textual)	1 Months Ended	6 Months Ended	12 Months Ended
	Jul. 31, 2014 USD ($)	Dec. 31, 2016 USD ($) mi	Dec. 31, 2016 USD ($) mi	Dec. 31, 2008 USD ($)	Dec. 31, 2003 USD ($)	Dec. 31, 2015 USD ($)
Accrual for Environmental Loss Contingencies		$ 16,703,000	$ 16,703,000			$ 8,329,000
Accrual for Environmental Loss Contingencies, Period Increase (Decrease)			9,994,000
Accrual for Environmental Loss Contingencies, Payments			1,620,000
Lorazepam and Clorazepate [Member]
Loss Contingency, Number of Plaintiffs				4
Judgment Amount Against Parties Payable Jointly and Severally				$ 19,200,000
Loss Contingency, Damages Awarded, Value				16,709,000
Loss Contingency, Prejudgment Interest				$ 7,500,000
Pending Increase (Decrease) in Damages Award Value	$ (9,600,000)
Lorazepam and Clorazepate [Member] | Indemnification Agreement [Member]
Payment in Exchange for Release and Full Indemnity Against Future Cost or Liabilities					$ 12,415,000
Bayonne [Member]
Accrual for Environmental Loss Contingencies		502,000	502,000
Clifton and Carlstadt [Member]
Accrual for Environmental Loss Contingencies		2,024,000	$ 2,024,000
Berrys Creek Site [Member]
Number of Subsidiaries Notice Received			2
Environmental Remediation Expense, Before Tax		7,517,000
Environmental Remediation Expense, Net of Tax		4,886,000
Environmental Exit Costs, Reasonably Possible Losses, Estimated Share			2.40%
Maybrook Site [Member]
Accrual for Environmental Loss Contingencies		692,000	$ 692,000
Accrual for Environmental Loss Contingencies, Period Increase (Decrease)			370,000
Harriman Site [Member]
Accrual for Environmental Loss Contingencies		3,515,000	3,515,000
Harriman Site [Member] | Minimum [Member]
Site Contingency Loss Exposure, Estimated Range			2,000,000
Harriman Site [Member] | Maximum [Member]
Site Contingency Loss Exposure, Estimated Range			7,000,000
Scientific Chemical Processing SCP Superfund Site [Member]
Accrual for Environmental Loss Contingencies		883,000	$ 883,000
Number of Other Sites Named PRP of SCP Superfund Site			130
Site Contingency, Recovery from Third Party of Environmental Remediation Cost			$ 565,000
Newark Bay Complex Litigation [Member]
Accrual for Environmental Loss Contingencies		$ 0	$ 0
Site Contingency Clean Up Plan, Miles of Clean Up | mi		8.3	8.3
Amount of Estimated Cost to Clean Up Site that the Company is Not Exposed			$ 1,380,000,000
Other Noncurrent Liabilities [Member]
Accrual for Environmental Loss Contingencies		$ 15,441,000	$ 15,441,000			$ 7,498,000