Note 4 - Stock-based Compensation (Details Textual)	3 Months Ended		6 Months Ended
	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) shares	Jun. 30, 2014 USD ($)
The 2003 Plan [Member]
Number of Stock-based Compensation Plans in Effect	3		3
Allocated Share-based Compensation Expense | $	$ 4,000	$ 12,000	$ 8,000	$ 33,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized | $	$ 34,000		$ 34,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross			12,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period			4,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period			12,000