Note 6 - Stockholders' Equity (Details Textual) - $ / shares	Dec. 31, 2018	Apr. 30, 2018	Dec. 31, 2017
Preferred Stock, Shares Authorized	1,000,000		1,000,000
Preferred Stock, Par or Stated Value Per Share	$ 0.0001		$ 0.0001
Preferred Stock, Shares Outstanding, Ending Balance	0		0
Preferred Stock, Shares Issued, Total	0		0
Common Class A [Member]
Common Stock, Shares Authorized	200,000,000		200,000,000
Common Stock and Temporary Equity, Shares, Outstanding, Ending Balance	41,400,000
Common Stock, Shares, Outstanding, Ending Balance	0		0
Common Stock, Shares, Issued, Total	0		0
Common Class B [Member]
Common Stock, Shares Authorized	15,000,000		15,000,000
Common Stock, Shares, Outstanding, Ending Balance	10,350,000	10,350,000	10,350,000
Common Stock, Shares, Issued, Total	10,350,000		10,350,000