BENEFIT PLANS: (Details 7) - $ / shares	12 Months Ended
	Apr. 30, 2017	Apr. 30, 2016
Number of Shares - Non-vested	19,000	28,000
Number of Shares - Granted	19,500	3,000
Number of Shares - Vested	(13,000)	(12,000)
Number of Shares - Forfeited	(1,000)
Number of Shares - Non-vested	24,500	19,000
Weighted Average Grant Date Fair Value Non-vested	$ 6.66	$ 6.98
Weighted Average Grant Date Fair Value Granted	5.04	5.22
Weighted Average Grant Date Fair Value Vested	6.80	6.94
Weighted Average Grant Date Fair Value Forfeited	6.90
Weighted Average Grant Date Fair Value Non-vested	$ 5.28	$ 6.66