Note 6 - Stockholders' Equity (Details Textual) - USD ($)			12 Months Ended
	Oct. 16, 2019	Oct. 11, 2019	Dec. 31, 2019	Dec. 31, 2018	Apr. 30, 2018
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
Stock Redeemed or Called During Period, Value			$ 36,823,301
Temporary Equity, Shares Outstanding			37,725,710	41,400,000
Preferred Stock, Shares Issued, Total			0	0
Warrants Tendered and Offered as Payment [Member]
Class of Warrant or Right, Issued During Period	248,000
Common Class A [Member]
Common Stock, Shares Authorized			200,000,000	200,000,000
Stock Redeemed or Called During Period, Shares		3,594,000	3,594,000
Stock Redeemed or Called During Period, Value		$ 36,823,301
Temporary Equity, Shares Outstanding			37,806,000	41,400,000
Common Stock, Shares, Outstanding, Ending Balance			80,290	0
Common Stock, Shares, Issued, Total			80,290	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