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Note 10 - Cash-settled Share-based Payments (Details Textual)	1 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended
	Jul. 31, 2017	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)	Jun. 30, 2019 GBP (£)
Statement Line Items [Line Items]
Liabilities from share-based payment transactions		$ 31,000		$ 31,000		$ 16,000
Weighted average fair value at measurement date, other equity instruments granted | £							£ 7.44
Expense from cash-settled share-based payment transactions in which goods or services received did not qualify for recognition as assets		762,000	$ 9,000	$ 946,000	$ 370,000
Restricted stock units (RSUs) [member]
Statement Line Items [Line Items]
Vesting period of other equity instruments				3
Weighted average fair value at measurement date, other equity instruments granted		17.32		$ 17.32		5.85
Restricted stock units (RSUs) [member] | Top of range [member]
Statement Line Items [Line Items]
Weighted average fair value at measurement date, other equity instruments granted						5.79
Performance share units (PSUs) [member]
Statement Line Items [Line Items]
Vesting period of other equity instruments				3
Liabilities from share-based payment transactions		1,426,000		$ 1,426,000		$ 524,000
Value of other equity instruments exercised or vested in share-based payment arrangement, share capital				216,000
Weighted average fair value at measurement date, other equity instruments granted		17.32		$ 17.32
Performance share units (PSUs) [member] | Bottom of range [member]
Statement Line Items [Line Items]
Performance probability				93.00%		93.00%
Weighted average fair value at measurement date, other equity instruments granted						$ 5.49
Performance share units (PSUs) [member] | Top of range [member]
Statement Line Items [Line Items]
Performance probability				100.00%		100.00%
Cash-settled awards [member]
Statement Line Items [Line Items]
Vesting period of other equity instruments	3
Liabilities from share-based payment transactions		$ 191,000	$ 70,000	$ 191,000	70,000
Number of other equity instruments granted in share-based payment arrangement	52,282
Expense from cash-settled share-based payment transactions in which goods or services received did not qualify for recognition as assets				$ 19,000	$ 26,000

X

- Definition

The probability that performance conditions will be met on performance share units.

+ References

No definition available.

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- Definition

The value of other equity instruments exercised or vested in share-based payment arrangement issued as share capital.

+ References

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- Definition

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- Definition

The amount of expense arising from cash-settled share-based payment transactions in which the goods or services received did not qualify for recognition as assets. [Refer: Expense from share-based payment transactions in which goods or services received did not qualify for recognition as assets]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2019-01-01
-Paragraph 112
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- Definition

The amount of liabilities arising from share-based payment transactions. Share-based payment transactions are transactions in which the entity: (a) receives goods or services from the supplier of those goods or services (including an employee) in a share-based payment arrangement; or (b) incurs an obligation to settle the transaction with the supplier in a share-based payment arrangement when another group entity receives those goods or services. [Refer: Share-based payment arrangements [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The number of other equity instruments (ie other than share options) granted in a share-based payment arrangement.

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The weighted average fair value at the measurement date of granted equity instruments other than share options. [Refer: Weighted average [member]]

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