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Note 15 - Commitments and Contingencies (Details Textual)
$ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Jan. 31, 2017
USD ($)
Dec. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jun. 30, 2014
USD ($)
Number Of Potentially Responsible Parties 150            
Estimated Cost of EPA Selected Remedy $ 1,000,000            
Estimated Time to Complete Selected EPA Remedy 13 years            
Proceeds from Insurance Settlement, Investing Activities       $ 2,123  
Gain (Loss) on Insurance Proceeds       1,641  
Letters of Credit Outstanding, Amount   $ 1,600   1,600      
Fire [Member]              
Proceeds from Insurance Settlement, Investing Activities       2,600      
Gain (Loss) on Insurance Proceeds   1,200 $ 400 1,600      
Insurance Settlements Receivable   500   500      
Business Interruption Costs       6,600      
Business Interruption Insurance Proceeds   4,000 $ 1,000 5,000      
Business Interruption Insurance Proceeds Receivable   $ 1,000   1,000      
Fire [Member] | Property, Plant and Equipment [Member]              
Unusual or Infrequent Item, or Both, Net (Gain) Loss, Total       900      
Fire [Member] | Inventory [Member]              
Unusual or Infrequent Item, or Both, Net (Gain) Loss, Total       $ 100      
Portland Harbor Natural Resources Trustee Council [Member]              
Loss Contingency, Accrual, Current             $ 400
Lower Willamette Group [Member]              
Number Of Potentially Responsible Parties 14