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Note 11 - Income Taxes (Details Textual) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Operating Loss Carryforwards, Valuation Allowance, Total	$ 0	$ 0
Percentage of Valuation Allowance	100.00%
Unrecognized Tax Benefits, Ending Balance	$ 0	0
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense, Total		$ 0
Earliest Tax Year [Member]
Open Tax Year	2014
Tax Year 2015 [Member]
Open Tax Year	2015
Tax Year 2016 [Member]
Open Tax Year	2016
Latest Tax Year [Member]
Open Tax Year	2017

X

- Definition

Represents the percentage of valuation allowance.

+ References

No definition available.

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X

- Definition

Tax year that remains open to examination under enacted tax laws, in CCYY format.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (e)
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X

- Definition

The portion of the valuation allowance pertaining to the deferred tax asset representing potential future taxable deductions from net operating loss carryforwards for which it is more likely than not that a tax benefit will not be realized.

+ References

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- Definition

Amount of unrecognized tax benefits.

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Amount of expense for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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