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Note 10 - Share-based Compensation - Share-based Compensation Expenses (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Total share-based compensation expense $ 2,790 $ 2,594 $ 8,019 $ 27,569
Share-based compensation capitalized in intangible assets     67 364
Total share-based compensation 2,812 2,675 8,086 28,114
Continuing Operations [Member]        
Share-based compensation capitalized in intangible assets 22 81 67 364
Continuing Operations [Member] | Selling and Marketing Expense [Member]        
Total share-based compensation expense 292 717 821 2,125
Continuing Operations [Member] | Research and Development Expense [Member]        
Total share-based compensation expense 278 136 800 487
Continuing Operations [Member] | General and Administrative Expense [Member]        
Total share-based compensation expense 2,220 1,741 6,398 3,835
Continuing Operations [Member] | Spin-off Transaction Costs [Member]        
Total share-based compensation expense 5,409
Discontinued Operations [Member]        
Total share-based compensation expense 15,713
Share-based compensation capitalized in intangible assets $ 181