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Note 7 - Commitments and Contingencies (Details Textual)
$ in Millions
1 Months Ended
Jan. 31, 2017
USD ($)
Sep. 30, 2024
USD ($)
Jun. 30, 2014
USD ($)
Letters of Credit Outstanding, Amount   $ 1.6  
Capital Addition Purchase Commitments [Member]      
Other Commitment, Amount Paid for Equipment Purchased Yet Not Received   1.2  
Other Commitment   $ 0.9  
Portland Harbor Natural Resources Trustee Council [Member]      
Loss Contingency, Accrual, Current     $ 0.4
Portland Harbor Superfund Site [Member]      
Number Of Potentially Responsible Parties 150    
Estimated Cost of EPA Selected Remedy $ 1,000.0    
Estimated Time to Complete Selected EPA Remedy (Year) 13 years    
Lower Willamette Group [Member]      
Number Of Potentially Responsible Parties 14