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Note 7 - Loan Payable - Schedule of Standby Fees Based on Total Funded Debt to EBITDA Ratio (Details)	3 Months Ended	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2021
Debt to EBITDA is Less Than 1 [Member]
Standby fees	0.30%
Debt to EBITDA is Greater Than or Equal to 1 and Less Than 2 [Member]
Standby fees	0.37%
Debt to EBITDA is Greater Than or Equal to 2 and Less Than 2.50 [Member]
Standby fees		0.47%
Debt to EBITDA is Greater Than or Equal to 2.50 [Member]
Standby fees		0.57%
Bank of Montreal and Royal Bank of Canada [Member] | London Interbank Offered Rate (LIBOR) [Member] | Debt to EBITDA is Less Than 1 [Member]
Basis Spread on Variable Rate	1.50%
Bank of Montreal and Royal Bank of Canada [Member] | London Interbank Offered Rate (LIBOR) [Member] | Debt to EBITDA is Greater Than or Equal to 1 and Less Than 2 [Member]
Basis Spread on Variable Rate	1.85%
Bank of Montreal and Royal Bank of Canada [Member] | London Interbank Offered Rate (LIBOR) [Member] | Debt to EBITDA is Greater Than or Equal to 2 and Less Than 2.50 [Member]
Basis Spread on Variable Rate		2.35%
Bank of Montreal and Royal Bank of Canada [Member] | London Interbank Offered Rate (LIBOR) [Member] | Debt to EBITDA is Greater Than or Equal to 2.50 [Member]
Basis Spread on Variable Rate		2.85%
Bank of Montreal and Royal Bank of Canada [Member] | Base Rate [Member] | Debt to EBITDA is Less Than 1 [Member]
Basis Spread on Variable Rate	0.25%
Bank of Montreal and Royal Bank of Canada [Member] | Base Rate [Member] | Debt to EBITDA is Greater Than or Equal to 1 and Less Than 2 [Member]
Basis Spread on Variable Rate	0.60%
Bank of Montreal and Royal Bank of Canada [Member] | Base Rate [Member] | Debt to EBITDA is Greater Than or Equal to 2 and Less Than 2.50 [Member]
Basis Spread on Variable Rate		1.10%
Bank of Montreal and Royal Bank of Canada [Member] | Base Rate [Member] | Debt to EBITDA is Greater Than or Equal to 2.50 [Member]
Basis Spread on Variable Rate		1.60%

X

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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X

- Details

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Namespace Prefix:
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- Details

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- Details

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- Details

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X

- Details

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- Details

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- Details

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