Common Stock (Narrative) (Details) - 6 months ended Oct. 31, 2016	USD ($) yr mo $ / shares shares	CAD yr mo shares
Common Stock 1 | shares	25,000	25,000
Common Stock 2 | shares	23,500	23,500
Common Stock 3 | shares	10,000	10,000
Common Stock 4 | shares	10,000	10,000
Common Stock 5 | shares	3,500	3,500
Common Stock 6	12.50%	12.50%
Common Stock 7 | mo	42	42
Common Stock 8	786,000	786,000
Common Stock 9	986,000	986,000
Common Stock 10	$ 2.50
Common Stock 11 | shares	319,822	319,822
Common Stock 12	$ 4.50
Common Stock 13	29.00
Common Stock 14	2.50
Common Stock 15	$ 112,158
Common Stock 16	88.55%	88.55%
Common Stock 17	0.00%	0.00%
Common Stock 18	1.23%	1.23%
Common Stock 19 | yr	3.7	3.7
Common Stock 20	15.00%	15.00%
Common Stock 21	$ 0
Common Stock 22	1.55
Common Stock 23	0
Common Stock 24	$ 3.10
Common Stock 25 | $ / shares	$ 2.01
Common Stock 26	$ 2.12
Common Stock 27	0	0
Common Stock 28	$ 0
Common Stock 29	0
Common Stock 30	91,395
Common Stock 31	216,228
Common Stock 32	155,986
Common Stock 33	307,968
Common Stock 34	$ 596,390
Common Stock 35 | yr	2.1	2.1
Common Stock 36	6.00%	6.00%
Common Stock 37	50.00%	50.00%
Common Stock 38	3.00%	3.00%
Common Stock 39	$ 18,197
Common Stock 40	$ 22,065
Common Stock 41 | shares	24,481	24,481
Common Stock 42 | shares	13,869	13,869
Common Stock 43 | shares	120,000	120,000
Common Stock 44 | shares	86,203	86,203
Common Stock 45 | shares	273,864	273,864
Common Stock 46 | shares	11,360	11,360
Common Stock 47	$ 3.80
Common Stock 48 | CAD		CAD 4.97
Common Stock 49	$ 43,168
Common Stock 50 | shares	2,900	2,900
Common Stock 51	$ 2.16
Common Stock 52 | CAD		CAD 2.81
Common Stock 53	$ 6,264
Common Stock 54 | shares	78,008	78,008
Common Stock 55 | shares	600	600
Common Stock 56	5.00%	5.00%
Common Stock 57 | shares	400,000	400,000
Common Stock 58 | shares	500,000	500,000
Common Stock 59	90,453	90,453
Common Stock 60	55,034	55,034
Common Stock 61	24,228	24,228
Common Stock 62	66,225	66,225
Common Stock 63 | shares	130,595	130,595
Common Stock 64	$ 175,195
Common Stock 65	$ 269,206
Common Stock 66 | yr	1.71	1.71
Common Stock 67 | yr	1.99	1.99