Note 12 - Share Option and Equity Incentive Plans - Expense Recognized During the Year Related to Share-based Compensation Transactions (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Continuing Operations [Member]
Share-based compensation	$ 3,613	$ 4,507
Discontinued Operations [Member]
Share-based compensation		1,044
Continued and Discontinued Operations [Member]
Share-based compensation	3,613	5,551
Cost of Revenue [Member]
Share-based compensation	74	182
Research and Development Expense [Member]
Share-based compensation	385	758
Selling and Marketing Expense [Member]
Share-based compensation	1,173	965
General and Administrative Expense [Member]
Share-based compensation	$ 1,981	$ 2,602