Note 4 - Stock-based Compensation (Details Textual)	3 Months Ended		9 Months Ended
	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($) shares	Sep. 30, 2014 USD ($)
Number of Stock-based Compensation Plans in Effect	3		3
Allocated Share-based Compensation Expense | $	$ 5,000	$ 14,000	$ 13,000	$ 44,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized | $	$ 28,000		$ 28,000
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