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Note 2 - Sale of Common Stock and Formation Transactions (Details Textual) - Common Stock [Member] - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Feb. 09, 2017
Aug. 03, 2015
Mar. 31, 2017
Stock Issued During Period, Shares, New Issues     6,390,149
Proceeds from Issuance of Private Placement   $ 130,199  
IPO [Member]      
Stock Issued During Period, Shares, New Issues 6,390,149    
Shares Issued, Price Per Share $ 13.50    
Proceeds from Issuance Initial Public Offering $ 78,855    
Private Placement [Member]      
Stock Issued During Period, Shares, New Issues   10,666,667  
Shares Issued, Price Per Share   $ 13.50