Note 6 - Fair Value Measurement and Financial Instruments (Details) - Fair Value Reconciliation of Stock-based Compensation Liability (USD $)	3 Months Ended	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2014
Condensed Cash Flow Statements, Captions [Line Items]
Change in fair value of stock-based compensation liability recorded as an adjustment to contributed surplus	$ 98,000	$ 118,000
Stock-based Compensation Liability [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Balance at beginning of period:	181,000	202,000
Change in fair value of stock-based compensation liability recorded as an adjustment to contributed surplus	(97,000)	(118,000)
Balance at end of period:	$ 84,000	$ 84,000