Note 1 - Basis of Presentation (Details Textual) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Operating Lease, Liability, Current	$ 1,140	$ 1,150
Operating Lease, Liability, Noncurrent	$ 1,687	1,940
Revision of Prior Period, Adjustment [Member]
Operating Lease, Liability, Current		476
Operating Lease, Liability, Noncurrent		$ (476)

Present value of lessee's discounted obligation for lease payments from operating lease, classified as noncurrent.

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=121603541&loc=SL77918627-209977

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