Note 10 - Summary of Amounts Recognized in Accumulated Other Comprehensive Income (Loss) at the End of the Period (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Intermittent Severance Plan [Member]
Net actuarial loss	$ 45	$ 57

After tax net amount of gain (loss) that are not yet recognized as a component of net periodic benefit cost, and that are recognized as increases (decreases) in other comprehensive income as they arise.

No definition available.

Name:	us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesAfterTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant