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Note 14 - Commitments and Contingencies (Details Textual)
$ in Millions
3 Months Ended
Mar. 31, 2022
USD ($)
Sites Identified 367
Sites Subject of Actions Taken by US Government 28
Sites on Superfund National Priorities List 18
Personal Injury [Member]  
Recorded Liability Related to Asserted Claims 94.00%
Recorded Liability Related to Unasserted Claims 6.00%
Personal Injury [Member] | Minimum [Member]  
Loss Contingency, Estimate of Possible Loss $ 332
Personal Injury [Member] | Maximum [Member]  
Loss Contingency, Estimate of Possible Loss $ 366