Note 10 - Acquisition - Assets and Liabilities Acquired (Details) (Parentheticals) - $ / shares		3 Months Ended
Jan. 31, 2019	Mar. 31, 2019
Shares issued (in shares)	1,834,142	1,834,142
Price per share (in dollars per share)		$ 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=35744584&loc=d3e6927-128479

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