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Note 1 - Summary of Significant Accounting Policies - Estimated Useful Life of Intangible Assets (Details)
12 Months Ended
Dec. 31, 2018
Patents [Member]  
Finite intangible assets, useful life (Year) 5 years
SAP Licenses [Member]  
Finite intangible assets, useful life (Year) 10 years
Other Licenses [Member]  
Finite intangible assets, useful life (Year) 5 years
Trademarks and Trade Names [Member]  
Finite intangible assets, useful life (Year) 7 years