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Options (Details Narrative) (10-K) - USD ($)
 1 Months Ended 6 Months Ended 12 Months Ended
May 31, 2019
Apr. 30, 2019
Apr. 30, 2018
Apr. 30, 2017
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Stock option granted 505,000 505,000 560,400 253,846 505,000   560,400 263,846
Stock option exercise price, upper range limit     $ 0.50 $ 0.65        
Stock option term     10 years 10 years        
Stock option vested, description     The options vest over a period of four to five years. The options vest over a period of one and four years.        
Option expense         $ 99,990 $ 88,072 $ 169,828 $ 267,835
Unrecognized compensation costs             $ 192,007  
Weighted average period term             6 years 11 months 23 days  
Four Option Granted [Member]                
Stock option granted       650,000        
Stock option term       10 years        
Option expense       $ 69,611        
Black-Scholes Option Price Model [Member]                
Fair value of options granted             $ 278,358 $ 169,100
Minimum [Member]                
Stock option vested period 4 years 4 years            
Weighted average period term         5 years   4 years 4 years 8 months 26 days
Maximum [Member]                
Stock option vested period 5 years 5 years            
Weighted average period term         7 years   5 years 7 years 6 months
Employee [Member]                
Stock option granted             560,400 263,846
Stock option exercise price, lower range limit             $ 0.41 $ 0.41
Stock option exercise price, upper range limit             $ 1.02 $ 1.02
Stock option term             10 years 10 years
Options expire date             Apr. 30, 2028 Apr. 30, 2028
Employee [Member] | Minimum [Member]                
Stock option vested period             4 years 4 years
Employee [Member] | Maximum [Member]                
Stock option vested period             5 years 5 years
Stock Option Plan [Member]                
Stock option, description         All options may be exercised for a period up to four 1/2 years following the grant date, after which they expire.   All options may be exercised for a period up to four 1/2 years following the grant date, after which they expire.  
Stock option vested period         5 years   5 years  
Stock option granted         2,000,000   2,000,000