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Note 2 - Summary of Significant Accounting Policies - Property, Plant and Equipment (Details)
12 Months Ended
Dec. 31, 2020
Machinery and Equipment [Member] | Minimum [Member]  
Property, plant and equipment useful life (Year) 3 years
Machinery and Equipment [Member] | Maximum [Member]  
Property, plant and equipment useful life (Year) 10 years
Computer Equipment and Software [member] | Minimum [Member]  
Property, plant and equipment useful life (Year) 3 years
Computer Equipment and Software [member] | Maximum [Member]  
Property, plant and equipment useful life (Year) 7 years
Furniture and Fixtures [Member] | Minimum [Member]  
Property, plant and equipment useful life (Year) 5 years
Furniture and Fixtures [Member] | Maximum [Member]  
Property, plant and equipment useful life (Year) 10 years