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Stockholders' Equity (Schedule of All Options and Exercisable Options) (Details)
12 Months Ended
Apr. 30, 2019
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
ALL OPTIONS, Outstanding No. of Options | shares 3,409,154
EXERCISABLE OPTIONS, Exercisable No. of Options | shares 2,244,861
$1.57 to $2.10 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
ALL OPTIONS, Exercise Price Lower Range $ 1.57
ALL OPTIONS, Exercise Price Upper Range 2.10
ALL OPTIONS, Weighted Average Exercise Price $ 1.96
ALL OPTIONS, Outstanding No. of Options | shares 919,390
EXERCISABLE OPTIONS, Weighted Average Exercise Price $ 1.96
EXERCISABLE OPTIONS, Weighted Average Remaining Life In Years 2 years 22 days
EXERCISABLE OPTIONS, Exercisable No. of Options | shares 919,390
$2.28 to $2.76 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
ALL OPTIONS, Exercise Price Lower Range $ 2.28
ALL OPTIONS, Exercise Price Upper Range 2.76
ALL OPTIONS, Weighted Average Exercise Price $ 2.32
ALL OPTIONS, Outstanding No. of Options | shares 471,081
EXERCISABLE OPTIONS, Weighted Average Exercise Price $ 2.32
EXERCISABLE OPTIONS, Weighted Average Remaining Life In Years 1 year 5 months 5 days
EXERCISABLE OPTIONS, Exercisable No. of Options | shares 471,081
$3.24 to $4.38 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
ALL OPTIONS, Exercise Price Lower Range $ 3.24
ALL OPTIONS, Exercise Price Upper Range 4.38
ALL OPTIONS, Weighted Average Exercise Price $ 4.20
ALL OPTIONS, Outstanding No. of Options | shares 333,224
EXERCISABLE OPTIONS, Weighted Average Exercise Price $ 3.86
EXERCISABLE OPTIONS, Weighted Average Remaining Life In Years 2 years 4 months 20 days
EXERCISABLE OPTIONS, Exercisable No. of Options | shares 261,834
$4.50 to $5.20 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
ALL OPTIONS, Exercise Price Lower Range $ 4.50
ALL OPTIONS, Exercise Price Upper Range 5.20
ALL OPTIONS, Weighted Average Exercise Price $ 4.96
ALL OPTIONS, Outstanding No. of Options | shares 718,292
EXERCISABLE OPTIONS, Weighted Average Exercise Price $ 4.90
EXERCISABLE OPTIONS, Weighted Average Remaining Life In Years 3 years 15 days
EXERCISABLE OPTIONS, Exercisable No. of Options | shares 336,833
$5.95 to $6.28 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
ALL OPTIONS, Exercise Price Lower Range $ 5.95
ALL OPTIONS, Exercise Price Upper Range 6.28
ALL OPTIONS, Weighted Average Exercise Price $ 6.07
ALL OPTIONS, Outstanding No. of Options | shares 80,417
EXERCISABLE OPTIONS, Weighted Average Exercise Price $ 6.13
EXERCISABLE OPTIONS, Weighted Average Remaining Life In Years 3 years 2 months 5 days
EXERCISABLE OPTIONS, Exercisable No. of Options | shares 36,806
$7.17 to $7.55 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
ALL OPTIONS, Exercise Price Lower Range $ 7.17
ALL OPTIONS, Exercise Price Upper Range 7.55
ALL OPTIONS, Weighted Average Exercise Price $ 7.39
ALL OPTIONS, Outstanding No. of Options | shares 662,417
EXERCISABLE OPTIONS, Weighted Average Exercise Price $ 7.51
EXERCISABLE OPTIONS, Weighted Average Remaining Life In Years 4 years 2 months 1 day
EXERCISABLE OPTIONS, Exercisable No. of Options | shares 144,139
$8.57 to $9.07 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
ALL OPTIONS, Exercise Price Lower Range $ 8.57
ALL OPTIONS, Exercise Price Upper Range 9.07
ALL OPTIONS, Weighted Average Exercise Price $ 8.97
ALL OPTIONS, Outstanding No. of Options | shares 224,333
EXERCISABLE OPTIONS, Weighted Average Exercise Price $ 8.97
EXERCISABLE OPTIONS, Weighted Average Remaining Life In Years 3 years 8 months 9 days
EXERCISABLE OPTIONS, Exercisable No. of Options | shares 74,778