Note 6 - Share Option and Equity Incentive Plans - Expense Recognized During the Year Related to Share-based Compensation Transactions (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Cost of Sales [Member]
Allocated Share-based Compensation Expense	$ 147	$ 37	$ 386	$ 91
Research and Development Expense [Member]
Allocated Share-based Compensation Expense	56	20	166	30
Selling and Marketing Expense [Member]
Allocated Share-based Compensation Expense	302	242	725	593
General and Administrative Expense [Member]
Allocated Share-based Compensation Expense	489	435	1,305	1,045
Allocated Share-based Compensation Expense	$ 994	$ 734	$ 2,582	$ 1,759