Note 15 - Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended			12 Months Ended
	Feb. 28, 2019	Nov. 30, 2018	Feb. 28, 2018	Dec. 31, 2018	Dec. 31, 2017	Aug. 31, 2018
Tax Cuts and Jobs Act of 2017 Transition Tax for Accumulated Foreign Earnings Income Tax Expense	$ 1,100	$ 2,300	$ 23,200
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent				21.00%	35.00%
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability			$ 2,200
Tax Adjustments, Settlements, and Unusual Provisions	(2,400)
Unrecognized Tax Benefits, Ending Balance	10,986					$ 9,223
Unrecognized Tax Benefits, Interest on Income Taxes Accrued	$ 1,300