PRIOR PERIOD REVISIONS (Tables)

6 Months Ended

Oct. 31, 2018

Accounting Changes and Error Corrections [Abstract]

Schedule of Error Corrections and Prior Period Adjustments [Table Text Block]

					Revised
	Balance		Adjustment		Balance
	April 30, 2017		Increase		May 1, 2017
Revisions to the consolidated financial statements:
Retained earnings	$	46,764	$	523	$	47,287

					Revised
	Balance		Adjustment		Balance
	July 31, 2017		Increase		August 1, 2017
Revisions to the consolidated financial statements:
Retained earnings	$	48,212	$	523	$	48,735

					Revised
	Balance		Adjustment		Balance
	October 31, 2017		Increase		November 1, 2017
Revisions to the consolidated financial statements:
Retained earnings	$	48,490	$	523	$	49,013

			Adjustment			Revised
	Balance		Increase			Balance
	April 30, 2018		(Decrease)			April 30, 2018
Revisions to the consolidated financial statements:
Deferred income taxes, net	$	5,060	$	(195	)	$	4,865
Accounts payable and accrued expenses	$	8,215	$	(718	)	$	7,497
Retained earnings	$	47,002	$	523		$	47,525

					Revised
	Balance		Adjustment		Balance
	July 31, 2018		Increase		August 1, 2018
Revisions to the consolidated financial statements:
Retained earnings	$	47,063	$	523	$	47,586