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Note 1 - Summary of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2020
Notes Tables  
Property, Plant and Equipment, Estimated Useful Lives [Table Text Block]
Leasehold improvements   Shorter of estimated useful life or remaining lease term (years)
Buildings and improvements 20 - 40
Machinery & equipment 7 - 15
Furniture, fixtures, computers & software 3 - 7