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Note 12 - Leases (Details Textual)
 12 Months Ended
Dec. 31, 2020
Statement Line Items [Line Items]  
Number of leases 2
Bottom of range [member]  
Statement Line Items [Line Items]  
Leases, term (Year) 3 years
Top of range [member]  
Statement Line Items [Line Items]  
Leases, term (Year) 6 years