Note 13 - Subsequent Event (Details Textual) - SAVSU [Member] - Subsequent Event [Member] shares in Millions	1 Months Ended
Aug. 08, 2019 shares
Business Acquisition, Percentage of Voting Interests Acquired	56.00%
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares	1.1

Percentage of voting equity interests acquired at the acquisition date in the business combination.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

Name:	us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant