Note 10 - Income Taxes (Details Textual) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		11 Months Ended
	Dec. 31, 2019	Mar. 31, 2020	Mar. 31, 2019	Nov. 30, 2019
Effective Income Tax Rate Reconciliation, Percent, Total		37.20%	34.10%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent		21.00%
Foreign Tax Authority [Member] | Kenya Revenue Authority [Member] | Tax Years 2013-2017 [Member]
Income Tax Examination, Settlement Demanded Including Accrued Interest and Penalties	$ 17			$ 202