Note 4 - Accounting for Stock-based Compensation - Equity Based Compensation Expense (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]
Share-based compensation expense	$ 1		$ 4
Selling and Marketing Expense [Member]
Share-based compensation expense	2	$ 5	8	$ 10
Research and Development Expense [Member]
Share-based compensation expense	3	6	14	13
General and Administrative Expense [Member]
Share-based compensation expense	38	59	155	129
Share-based compensation expense	$ 44	$ 70	$ 181	$ 152