Related party (Narrative) (Details) - $ / shares |
Jan. 31, 2019 |
Jul. 19, 2018 |
Apr. 30, 2018 |
|---|---|---|---|
| Related Party Transaction [Line Items] | Ìý | Ìý | Ìý |
| Per share price | $ 0.001 | Ìý | $ 0.001 |
| Common Stock [Member] | Ìý | Ìý | Ìý |
| Related Party Transaction [Line Items] | Ìý | Ìý | Ìý |
| Treasury stock repurchased | Ìý | 1,000,000 | Ìý |
| Per share price | Ìý | $ 7.40 | Ìý |
| Sale of common stock per share price | Ìý | $ 7.40 | Ìý |
| X | ||||||||||
- Definition Face amount or stated value per share of common stock. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
|
| X | ||||||||||
- Definition Per share or per unit amount of equity securities issued. No definition available.
|
| X | ||||||||||
- Definition Number of previously issued common shares repurchased by the issuing entity and held in treasury. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Details
|