Note 13 - Revenue - Summary of Remaining Performance Obligations 2 (Details) $ in Thousands	Jun. 30, 2021 USD ($)
Rental Revenue [Member]
Service revenue, expected to be recognized in the future	$ 12,485
Rental Revenue [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-01
Service revenue, expected to be recognized in the future	$ 4,840
Service revenue, expected to be recognized in the future, period (Year)	6 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	$ 6,923
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	$ 722
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
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	$ 563
Service Revenue [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-01
Service revenue, expected to be recognized in the future	$ 491
Service revenue, expected to be recognized in the future, period (Year)	6 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