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		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Cost of Sales [Member]
Allocated Share-based Compensation Expense	$ 122	$ 43	$ 239	$ 54
Research and Development Expense [Member]
Allocated Share-based Compensation Expense	56	4	110	10
Selling and Marketing Expense [Member]
Allocated Share-based Compensation Expense	106	262	423	351
General and Administrative Expense [Member]
Allocated Share-based Compensation Expense	429	451	816	610
Allocated Share-based Compensation Expense	$ 713	$ 760	$ 1,588	$ 1,025