5. ACCOUNTS RECEIVABLE

12 Months Ended

May 31, 2019

Receivables [Abstract]

5. ACCOUNTS RECEIVABLE

5. ACCOUNTS RECEIVABLE:

    Accounts receivable comprise (in thousands):

	May 31,
	2019		2018
Accounts receivable	$	4,859	$	2,860
Less: Allowance for doubtful accounts		—		(4	)
	$	4,859	$	2,856

			Additions
	Balance at		charged to					Balance
	beginning		costs and					at end
	of year		expenses		Deductions*			of year
Allowance for doubtful accounts receivable:
May 31, 2019	$	4	$	—	$	(4	)	$	—
May 31, 2018	$	61	$	4	$	(61	)	$	4

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