Note 4 - Stockholders' Equity (Details) - Allocation of Recognized Period Costs (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Allocation of Recognized Period Costs	$ 2,226	$ 1,924	$ 6,259	$ 4,942
Cost of Sales [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Allocation of Recognized Period Costs	947	812	2,467	1,995
Research and Development Expense [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Allocation of Recognized Period Costs	426	484	1,230	1,143
Selling, General and Administrative Expenses [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Allocation of Recognized Period Costs	$ 853	$ 628	$ 2,562	$ 1,804