Note 8 - Long-term Debt (Details Textual) $ in Millions, $ in Millions	May 31, 2022 CAD ($)	Oct. 01, 2021 USD ($)	Sep. 14, 2021 USD ($)	Dec. 31, 2022 USD ($)
Line of Credit Facility, Maximum Borrowing Capacity				$ 20
Revolving Credit Facility [Member] | RTC Canada [Member]
Line of Credit Facility, Maximum Borrowing Capacity	$ 120
Line of Credit Facility, Additional Borrowing Capacity Upon Request	$ 20
Revolving Credit Facility [Member] | CDOR [Member] | RTC Canada [Member]
Debt Instrument, Basis Spread on Variable Rate	1.35%
WF Lenders [Member] | Revolving Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity			$ 175
WF Lenders [Member] | Revolving Credit Facility [Member] | Minimum [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Debt Instrument, Basis Spread on Variable Rate			1.25%
WF Lenders [Member] | Revolving Credit Facility [Member] | Maximum [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Debt Instrument, Basis Spread on Variable Rate			1.50%
PLC Agreement [Member] | Revolving Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity		$ 300
PLC Agreement [Member] | Revolving Credit Facility [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Debt Instrument, Basis Spread on Variable Rate		1.55%
PLC Agreement [Member] | Revolving Credit Facility [Member] | Minimum [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Debt Instrument, Basis Spread on Variable Rate		0.00%