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Note 20 - Subsequent Events (Details Textual) $ in Millions	Feb. 09, 2021 USD ($)	Dec. 31, 2020	Feb. 13, 2020 USD ($)	Feb. 12, 2020 USD ($)	Dec. 31, 2019
Royal Bank, Bank of Montreal, Bank of Nova Scotia, HSBC and CIBC [Member]
Total Funded Debt to EBITDA Ratio		2			2
Stock Buyback Program 2021 [Member] | Subsequent Event [Member]
Stock Repurchase Program, Authorized Amount	$ 40
Stock Buyback Program 2020 [Member]
Stock Repurchase Program, Authorized Amount			$ 40	$ 40

X

- Definition

Ratio of total funded debt to EDITDA.

+ References

No definition available.

+ Details

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X

- Definition

Amount of stock repurchase plan authorized.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Period Type: