8. PRODUCT WARRANTIES (Tables)

9 Months Ended

Feb. 28, 2019

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, 2019 and 2018 (in thousands):

	Three Months Ended						Nine Months Ended
	February 28,						February 28,
	2019			2018			2019			2018
Balance at the beginning of the period	$	163		$	133		$	135		$	113
Accruals for warranties issued during the period		30			5			176			251
Consumption of reserves		(30	)		(22	)		(148	)		(248	)
Balance at the end of the period	$	163		$	116		$	163		$	116