Note 3 - Business Combinations - Consideration (Details) - USD ($) $ in Thousands		9 Months Ended
Aug. 08, 2019	Sep. 30, 2019	Sep. 30, 2018
Stock consideration for 55.6% equity interest purchased		$ 19,932
SAVSU [Member]
Stock consideration for 55.6% equity interest purchased	$ 19,932

Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=116859721&loc=d3e6613-128477

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=116859721&loc=d3e6578-128477

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