Note 7 - Income Taxes (Details) - Net Operating Loss Carryforwards (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Operating Loss Carryforwards [Line Items]
Operating loss carryforward	$ 20,112	$ 18,647
2019 [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforward	2,901	2,901
2021 [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforward	1,184	1,184
2022 [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforward	1,083	1,083
2023 [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforward	1,302	1,302
Thereafter [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforward	$ 13,642	$ 12,177