18. SELECTED QUARTERLY CONSOLIDATED FINANCIAL DATA (Tables)

12 Months Ended

May 31, 2019

Quarterly Financial Information Disclosure [Abstract]

Selected quarterly consolidated financial data (unaudited)

    The following tables (presented in thousands, except per share data) sets forth selected unaudited condensed consolidated statements of operations data for each of the four quarters of the fiscal years ended May 31, 2019 and 2018.

	Three Months Ended
	Aug. 31,			Nov. 30,			Feb. 28,			May 31,
	2018			2018			2019			2019
Net sales	$	4,740		$	5,911		$	3,163		$	7,242
Gross profit	$	1,553		$	2,398		$	272		$	3,379
Net (loss) income	$	(1,515	)	$	(629	)	$	(3,201	)	$	110
Net (loss) income per share basic and diluted	$	(0.07	)	$	(0.03	)	$	(0.14	)	$	0.00

	Three Months Ended
	Aug. 31,		Nov. 30,		Feb. 28,		May 31,
	2017		2017		2018		2018
Net sales	$	6,970	$	7,923	$	7,393	$	7,269
Gross profit	$	2,918	$	3,131	$	3,176	$	3,161
Net income	$	10	$	60	$	267	$	191
Net income per share basic and diluted	$	0.00	$	0.00	$	0.01	$	0.01