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Note 8 - Guarantees (Details Textual)
3 Months Ended
Mar. 31, 2018
USD ($)
Warranty Arrangements Period [Member]  
Guarantee Obligations [Line Items]  
Extended Warranty Period 1 year
Maximum [Member]  
Guarantee Obligations [Line Items]  
Environmental Settlement Historical Liabilities Trigger Amount $ 99,000,000
Percentage of Liability Above 99 Million 50.00%
Extended Warranty Period 6 years
Minimum [Member]  
Guarantee Obligations [Line Items]  
Extended Warranty Period 3 months
Amended Eastman Business Park Settlement Agreement [Member]  
Guarantee Obligations [Line Items]  
Accrual for Environmental Loss Contingencies $ 0
Financial Guarantee [Member] | Guarantor Subsidiaries [Member]  
Guarantee Obligations [Line Items]  
Guarantor Obligations, Maximum Exposure, Undiscounted 7,000,000
Guarantor Obligations, Current Carrying Value $ 3,000,000