Note 8 - Inventories (Details Textual) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Inventory, Noncurrent, Total	$ 4,541	$ 3,833

Inventories not expected to be converted to cash, sold or exchanged within the normal operating cycle.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.6(d))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Name:	us-gaap_InventoryNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant