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Note 1 - Summary of Significant Accounting Policies - Estimated Useful Life of Property and Equipment (Details)
12 Months Ended
Dec. 31, 2018
Leasehold Improvements [Member]  
Estimated useful life (Year) 10 years
Equipment [Member] | Minimum [Member]  
Estimated useful life (Year) 3 years
Equipment [Member] | Maximum [Member]  
Estimated useful life (Year) 10 years
Furniture, Fixtures, Fittings, and Other [Member] | Minimum [Member]  
Estimated useful life (Year) 2 years
Furniture, Fixtures, Fittings, and Other [Member] | Maximum [Member]  
Estimated useful life (Year) 10 years