Number of new stock issued during the period.

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

Note 2 - Sale of Common Stock, Formation Transactions and Preferred Stock Redemption (Details Textual) - USD ($) $ / shares in Units, $ in Thousands			12 Months Ended
	Jun. 21, 2017	Feb. 09, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Payments for Repurchase of Redeemable Preferred Stock	$ 145
Common Stock [Member]
Stock Issued During Period, Shares, New Issues				6,390,149
IPO [Member] \| Common Stock [Member]
Stock Issued During Period, Shares, New Issues		6,390,149
Shares Issued, Price Per Share		$ 13.50
Proceeds from Issuance Initial Public Offering		$ 78,685