Note 4 - Stockholders' Equity (Details) - Allocation of Recognized Period Costs (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocation of Recognized Period Costs	$ 1,660	$ 1,309
Cost of Sales [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocation of Recognized Period Costs	724	534
Research and Development Expense [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocation of Recognized Period Costs	371	322
Selling, General and Administrative Expenses [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocation of Recognized Period Costs	$ 565	$ 453