Note 2 - Mergers and Acquisitions - Assets Acquired and Liabilities Assumed (Details) (Parentheticals) - shares	Jan. 01, 2019	Jan. 31, 2018
Big Muddy Bancorp Acquisition [Member]
Common stock issued, shares (in shares)	996,041
TwinCo Acquisition [Member]
Common stock issued, shares (in shares)		446,774

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

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Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration