Note 7 - Stock-based Compensation - Allocation of Share-based Compensation Expense (Details) - Restricted Stock [Member] - 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]
Allocation of Share-Based Compensation Expense	$ 3	$ 2	$ 8	$ 8
Selling and Marketing Expense [Member]
Allocation of Share-Based Compensation Expense	1	1	4	5
Research and Development Expense [Member]
Allocation of Share-Based Compensation Expense	2	3	7	14
General and Administrative Expense [Member]
Allocation of Share-Based Compensation Expense	24	24	72	77
Allocation of Share-Based Compensation Expense	$ 30	$ 30	$ 91	$ 104