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Note 2 - Issuance of Common Stock and Preferred Stock Redemption (Details Textual) - USD ($) $ / shares in Units, $ in Thousands				12 Months Ended
	Apr. 09, 2019	Jun. 21, 2017	Feb. 09, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Payments for Repurchase of Redeemable Preferred Stock		$ 145
Director [Member]
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture, Total	1,917
Proceeds from Issuance of Common Stock	$ 0
Common Stock [Member]
Stock Issued During Period, Shares, New Issues				1,917		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			$ 79,000