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Note 13 - Recent Accounting and Reporting Developments (Details Textual) - USD ($) $ in Thousands	Mar. 31, 2019	Jan. 01, 2019	Dec. 31, 2018	Dec. 31, 2017
Cumulative Effect of New Accounting Principle in Period of Adoption				$ (875)
Operating Lease, Liability, Total	$ 8,286
AOCI Attributable to Parent [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption			(235)
Retained Earnings [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption			$ 235	$ (875)
Accounting Standards Update 2016-02 [Member]
Operating Lease, Right-of-Use Asset		$ 8,000
Operating Lease, Liability, Total		8,000
Accounting Standards Update 2018-02 [Member] | AOCI Attributable to Parent [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption		(200)
Accounting Standards Update 2018-02 [Member] | Retained Earnings [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption		$ 200

X

- Definition

Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption.

+ References

No definition available.

+ Details

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X

- Definition

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

+ References

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)
-URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977

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X

- Definition

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

+ References

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