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Note 12 - Employee Benefit Plan (Details)	12 Months Ended
	Dec. 31, 2014
Disclosure Text Block Supplement [Abstract]
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent	15.00%us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent

X

- Definition

Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_DisclosureTextBlockSupplementAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration