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Note 7 - Long-lived Assets (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Construction in Progress Expenditures Incurred but Not yet Paid $ 463 $ 758
Amortization of Intangible Assets, Total 733 1,683
Industrial Solutions [Member]    
Goodwill and Intangible Asset Impairment, Total 0  
Gearing [Member]    
Goodwill and Intangible Asset Impairment, Total $ 0  
Red Wolf [Member] | Trade Names [Member]    
Accelerated Amortization of Intangible Assets   $ 871
Minimum [Member]    
Finite-Lived Intangible Asset, Useful Life (Year) 6 years  
Minimum [Member] | Red Wolf [Member]    
Finite-Lived Intangible Asset, Useful Life (Year) 2 years  
Maximum [Member]    
Finite-Lived Intangible Asset, Useful Life (Year) 20 years  
Maximum [Member] | Red Wolf [Member]    
Finite-Lived Intangible Asset, Useful Life (Year) 7 years