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Note 8 - Equity - Schedule of Stockholders' Equity (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Balances     $ 86,625 $ 31,131
Share-based compensation     5,163 6,068
Forfeited restricted shares     (310)  
Exercise of options     83  
Accretion of contingently redeemable noncontrolling interest     (158)  
Foreign currency translation adjustment loss $ (41) $ (277) (116) (226)
Net loss (20,143) (15,184) (57,480) (45,445)
Issuance of ordinary shares       31,395
Balances $ 33,807 $ 22,923 $ 33,807 $ 22,923
Common Stock [Member]        
Balances (in shares)     39,141,913 27,885,613
Balances     $ 4 $ 3
Share-based compensation (in shares)     12,248 17,198
Share-based compensation     $ 0 $ 0
Forfeited restricted shares (in shares)     (40,679)  
Forfeited restricted shares     $ 0  
Exercise of options (in shares)     28,771  
Exercise of options     $ 0  
Accretion of contingently redeemable noncontrolling interest     0  
Foreign currency translation adjustment loss     0 0
Net loss     $ 0 $ 0
Issuance of ordinary shares (in shares)       2,613,590
Issuance of ordinary shares       $ 0
Balances (in shares) 39,142,253 30,516,401 39,142,253 30,516,401
Balances $ 4 $ 3 $ 4 $ 3
Additional Paid-in Capital [Member]        
Balances     366,451 246,979
Share-based compensation     5,143 5,936
Forfeited restricted shares     (310)  
Exercise of options     83  
Accretion of contingently redeemable noncontrolling interest     (158)  
Foreign currency translation adjustment loss     0 0
Net loss     0 0
Issuance of ordinary shares       31,395
Balances 371,209 284,310 371,209 284,310
Retained Earnings [Member]        
Balances     (277,818) (216,845)
Share-based compensation     0 0
Forfeited restricted shares     0  
Exercise of options     0  
Accretion of contingently redeemable noncontrolling interest     0  
Foreign currency translation adjustment loss     0 0
Net loss     (54,666) (43,377)
Issuance of ordinary shares       0
Balances (332,484) (260,222) (332,484) (260,222)
AOCI Attributable to Parent [Member]        
Balances     (297) 140
Share-based compensation     0 0
Forfeited restricted shares     0  
Exercise of options     0  
Accretion of contingently redeemable noncontrolling interest     0  
Foreign currency translation adjustment loss     (101) (187)
Net loss     0 0
Issuance of ordinary shares       0
Balances (398) (47) (398) (47)
Parent [Member]        
Balances     88,340 30,277
Share-based compensation     5,143 5,936
Forfeited restricted shares     (310)  
Exercise of options     83  
Accretion of contingently redeemable noncontrolling interest     (158)  
Foreign currency translation adjustment loss     (101) (187)
Net loss     (54,666) (43,377)
Issuance of ordinary shares       31,395
Balances 38,331 24,044 38,331 24,044
Noncontrolling Interest [Member]        
Balances     (1,715) 854
Share-based compensation     20 132
Forfeited restricted shares     0  
Exercise of options     0  
Accretion of contingently redeemable noncontrolling interest     0  
Foreign currency translation adjustment loss     (15) (39)
Net loss     (2,814) (2,068)
Issuance of ordinary shares       0
Balances $ (4,524) $ (1,121) $ (4,524) $ (1,121)