Note 1 - Basis of Consolidation and Presentation (Details) - Fair Value of Financial Assets and Liabilities (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Note 1 - Basis of Consolidation and Presentation (Details) - Fair Value of Financial Assets and Liabilities [Line Items]
Fair value of financial asset	$ 18,236	$ 7,487
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Note 1 - Basis of Consolidation and Presentation (Details) - Fair Value of Financial Assets and Liabilities [Line Items]
Fair value of financial asset	7,578	5,245
Money Market Funds [Member]
Note 1 - Basis of Consolidation and Presentation (Details) - Fair Value of Financial Assets and Liabilities [Line Items]
Fair value of financial asset	7,578	5,245
Commercial Paper [Member] | Fair Value, Inputs, Level 1 [Member]
Note 1 - Basis of Consolidation and Presentation (Details) - Fair Value of Financial Assets and Liabilities [Line Items]
Fair value of financial asset	10,658	2,242
Commercial Paper [Member]
Note 1 - Basis of Consolidation and Presentation (Details) - Fair Value of Financial Assets and Liabilities [Line Items]
Fair value of financial asset	10,658	2,242
Fair Value, Inputs, Level 1 [Member]
Note 1 - Basis of Consolidation and Presentation (Details) - Fair Value of Financial Assets and Liabilities [Line Items]
Fair value of financial asset	$ 18,236	$ 7,487