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Note 11 - Guarantees (Details Textual)
6 Months Ended
Jun. 30, 2019
USD ($)
Warranty Arrangements Period [Member]  
Guarantee Obligations [Line Items]  
Extended Warranty Period 1 year
Amended Eastman Business Park Settlement Agreement [Member]  
Guarantee Obligations [Line Items]  
Accrual for Environmental Loss Contingencies $ 0
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
Financial Guarantee [Member] | Guarantor Subsidiaries [Member]  
Guarantee Obligations [Line Items]  
Guarantor Obligations, Maximum Exposure, Undiscounted $ 2,000,000
Financial Guarantee [Member] | Guarantor Subsidiaries [Member] | Maximum [Member]  
Guarantee Obligations [Line Items]  
Cash collateral for guaranty $ 1,000,000