Note 1 - Basis of Consolidation and Presentation (Details) - Fair Value of Financial Assets and Liabilities (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Note 1 - Basis of Consolidation and Presentation (Details) - Fair Value of Financial Assets and Liabilities [Line Items]
Financial assets and liabilities	$ 30,672	$ 21,242
Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member]
Note 1 - Basis of Consolidation and Presentation (Details) - Fair Value of Financial Assets and Liabilities [Line Items]
Financial assets and liabilities	8,147	7,266
Fair Value, Inputs, Level 1 [Member] | Commercial Paper [Member]
Note 1 - Basis of Consolidation and Presentation (Details) - Fair Value of Financial Assets and Liabilities [Line Items]
Financial assets and liabilities	22,525	13,976
Fair Value, Inputs, Level 1 [Member]
Note 1 - Basis of Consolidation and Presentation (Details) - Fair Value of Financial Assets and Liabilities [Line Items]
Financial assets and liabilities	30,672	21,242
Money Market Funds [Member]
Note 1 - Basis of Consolidation and Presentation (Details) - Fair Value of Financial Assets and Liabilities [Line Items]
Financial assets and liabilities	8,147	7,266
Commercial Paper [Member]
Note 1 - Basis of Consolidation and Presentation (Details) - Fair Value of Financial Assets and Liabilities [Line Items]
Financial assets and liabilities	$ 22,525	$ 13,976