REVENUE RECOGNITION (Details - Contracts in Progess) - USD ($) $ in Thousands	Aug. 31, 2021	Aug. 31, 2020	Aug. 31, 2019
Revenue from Contract with Customer [Abstract]
Revenues in excess of billings	$ 3,150	$ 3,093	$ 3,234
Billings in excess of revenues	(117)	(141)	(799)
Revenues over billings on uncompleted contracts	3,033	2,952	2,435
Revenues earned to date on uncompleted contracts	15,184	20,235	19,255
Billings to date on uncompleted contracts	$ (12,151)	$ (17,283)	$ (16,820)