Note 2 - Cash, Cash Equivalents and Investments (Details) - Discounted Cash Flow Model Values	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Time-to-liquidity (months)	24	24
Expected return	2.50%	1.80%
Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	3.30%	2.50%
Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	8.10%	7.30%