Commitments and contingencies (Detail Textuals)		1 Months Ended	12 Months Ended
	Jun. 06, 2018 Investor $ / shares shares	May 19, 2018 shares	Jun. 30, 2019 $ / shares shares	Jun. 30, 2018 $ / shares shares
Commitments And Contingencies [Line Items]
Number of common share issued			1,707,000	30,303,000
Common stock, value per share | $ / shares			$ 0.001	$ 0.001
Franchisee Contract
Commitments And Contingencies [Line Items]
Term of contract		18 months
Consideration shares of common stock		300,000
Number of common share issued		50,000
Vesting period		3 months
Investor Agreement | Private Placement
Commitments And Contingencies [Line Items]
Number of investors | Investor	2
Investor Agreement | Private Placement | June 6 through June 30, 2018
Commitments And Contingencies [Line Items]
Number of common share issued	300,000
Common stock, value per share | $ / shares	$ 1.00
Investor Agreement | Private Placement | July 1 through September 30, 2018
Commitments And Contingencies [Line Items]
Number of common share issued	1,000,000
Number of common stock shares purchased by investors	0
Common stock, value per share | $ / shares	$ 1.00
Investor Agreement | Private Placement | October 1 through December 31, 2018
Commitments And Contingencies [Line Items]
Number of common share issued	1,333,333
Number of common stock shares purchased by investors	0
Common stock, value per share | $ / shares	$ 1.50