Note 10 - Acquisition - Assets and Liabilities Acquired (Details) (Parentheticals)	12 Months Ended
Dec. 31, 2019 $ / shares shares
Shares issued (in shares) \| shares	1,834,142
Price per share (in dollars per share) \| $ / shares	$ 10.69

Number of shares of equity interests issued or issuable to acquire entity.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)(4)
-URI http://asc.fasb.org/extlink&oid=120321790&loc=d3e6927-128479

Name:	us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration