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Note 9 - Quarterly Financial Information (Unaudited) - Quarterly Operating Results (Details) - USD ($)	2 Months Ended	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Net revenues
Operating expenses		104,489	81,332	133,311	450	5,881				319,582	5,881
Loss from operations		(104,489)	(81,332)	(133,311)	(450)	(5,881)				(319,582)	(5,881)
Other income - investment income on Trust Account		2,331,871	1,961,856	1,484,040						5,777,767
Income tax provision		504,446	394,468	284,000						1,182,914
Net income (loss)		$ 1,722,936	$ 1,486,056	$ 1,066,729	$ (450)	$ (5,881)				$ 4,275,271	$ (5,881)
Common Class A [Member]
Basic and diluted income per common share (in dollars per share)		$ 0.04	$ 0.04	$ 0.03						$ 0.11
Common Class B [Member]
Basic and diluted income per common share (in dollars per share)		$ 0	$ 0	$ 0	$ 0	$ 0				$ (0.01)	$ 0