Note 14 - Weighted Average Shares Outstanding and Net Income (Loss) Per Share - Reconciliation of the Weighted Average Shares Outstanding (Details) (Parentheticals) - The 2.75% Convertible Notes [Member]	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020	Nov. 30, 2019
Interest rate	2.75%	2.75%	2.75%	2.75%
Convertible Debt Securities [Member]
Interest rate	2.75%		2.75%