Note 7 - Cash, Cash Equivalents and Investments (Details) - Discounted Cash Flow Model Values	Mar. 31, 2014	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Time-to-liquidity (months)	24	24
Expected return	2.70%	2.50%
Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	3.60%	3.30%
Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	8.40%	8.10%