Note 13 - Revenue - Summary of Remaining Performance Obligations 2 (Details) $ in Thousands	Sep. 30, 2021 USD ($)
Rental Revenue [Member]
Service revenue, expected to be recognized in the future	$ 11,138
Rental Revenue [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-10-01
Service revenue, expected to be recognized in the future	$ 2,983
Service revenue, expected to be recognized in the future, period (Year)	3 months
Rental Revenue [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Service revenue, expected to be recognized in the future	$ 7,733
Service revenue, expected to be recognized in the future, period (Year)	1 year
Rental Revenue [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Service revenue, expected to be recognized in the future	$ 422
Service revenue, expected to be recognized in the future, period (Year)	1 year
Rental Revenue [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Service revenue, expected to be recognized in the future	$ 0
Service revenue, expected to be recognized in the future, period (Year)	1 year
Service Revenue [Member]
Service revenue, expected to be recognized in the future	$ 112
Service Revenue [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-10-01
Service revenue, expected to be recognized in the future	$ 40
Service revenue, expected to be recognized in the future, period (Year)	3 months
Service Revenue [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Service revenue, expected to be recognized in the future	$ 31
Service revenue, expected to be recognized in the future, period (Year)	1 year
Service Revenue [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Service revenue, expected to be recognized in the future	$ 31
Service revenue, expected to be recognized in the future, period (Year)	1 year
Service Revenue [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Service revenue, expected to be recognized in the future	$ 10
Service revenue, expected to be recognized in the future, period (Year)	1 year