Note 10 - Contingency (Details Textual) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended
	Aug. 31, 2018	Jul. 31, 2018	Jul. 31, 2017
Refund of Tax		$ 279
Appeal of BHCMC, LLC [Member]
Refund of Tax		$ 279
Appeal of BHCMC, LLC [Member] | Subsequent Event [Member]
Refund of Tax	$ 1,300