9. PRODUCT WARRANTIES (Tables)

9 Months Ended

Feb. 28, 2018

Product Warranties Disclosures [Abstract]

Liability for product warranties

    The following is a summary of changes in the Company's liability for product warranties during the three and nine months ended February 28, 2018 and February 28, 2017 (in thousands):

	Three Months  Ended						Nine Months  Ended
	February 28,						February 28,
	2018			2017			2018			2017
Balance at the beginning of the period	$	133		$	72		$	113		$	155
Accruals for warranties issued during the period		5			37			251			48
Accruals and adjustments (change in estimates) related to pre-existing warranties during the period		--			--			--			(54	)
Consumption of reserves		(22	)		(23	)		(248	)		(63	)
Balance at the end of the period	$	116		$	86		$	116		$	86