13. Income Taxes (Details) - Schedule of Effective Income Tax Rate Reconciliation - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2017	Apr. 30, 2016
Schedule of Effective Income Tax Rate Reconciliation [Abstract]
Statutory rate	$ (2,394)	$ 1,113
State and local tax	(317)	85
Valuation allowance on deferred tax assets	260	425
Effect of foreign operations	21	41
Nondeductible expenses	36	166
Worthless Securities	(1,543)	0
Uncertain tax positions	1,511	0
Domestic production activities deduction	66	(159)
Nontaxable life insurance cash value increase	(135)	(282)
Tax credits	(203)	(417)
Rate Change	477	0
Other items	106	98
	$ (2,115)	$ 1,070