Note 2 - Basis of Presentation and Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Operating Lease, Right-of-Use Asset	$ 9,501
Operating Lease, Liability, Total	9,200
Operating Lease, Right-of-Use Asset [Member]
Prepaid Rent	$ 301

Present value of lessee's discounted obligation for lease payments from operating lease.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (b)
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- Definition

Amount of lessee's right to use underlying asset under operating lease.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
-Section 45
-Paragraph 1
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- Definition

Amount of asset related to consideration paid in advance for rent that provides economic benefits within a future period of one year or the normal operating cycle, if longer.

+ References

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-Publisher FASB
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-SubTopic 10
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