5. ACCOUNTS RECEIVABLE (Tables)

12 Months Ended

May 31, 2020

Receivables [Abstract]

Accounts receivable

    Accounts receivable comprise (in thousands):

	May 31,
	2020		2019
Accounts receivable	$	3,717	$	4,859
Less: Allowance for doubtful accounts		--		--
	$	3,717	$	4,859

			Additions
	Balance at		charged to					Balance
	beginning		costs and					at end
	of year		expenses		Deductions*			of year
Allowance for doubtful accounts receivable:
May 31, 2020	$	0	$	--	$	(0	)	$	--
May 31, 2019	$	4	$	--	$	(4	)	$	--

    * Deductions include write-offs of uncollectible accounts, collections of amounts previously reserved, and releases of allowance for doubtful accounts credited to expense.