Note 7 - Equipment Held for Sale (Details Textual) - USD ($) $ in Thousands	3 Months Ended
Sep. 30, 2019	Dec. 31, 2018
Property, Plant and Equipment, Negotiated Sales Price	$ 600
Equipment Held-for-sale, Current	585
Restructuring Plan 2019 [Member]
Property, Plant and Equipment, Disposals	$ 585

Amount of divestiture of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

No definition available.

Name:	us-gaap_PropertyPlantAndEquipmentDisposals
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration