Note 12 - Revenue - Summary of Remaining Performance Obligations 2 (Details) $ in Thousands	Mar. 31, 2021 USD ($)
Rental Revenue [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-04-01
Service revenue, expected to be recognized in the future	$ 6,070
Service revenue, expected to be recognized in the future, period (Year)	9 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	$ 8,651
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	$ 0
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]: 2025-01-01
Service revenue, expected to be recognized in the future	$ 15,443
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]: 2021-04-01
Service revenue, expected to be recognized in the future	$ 736
Service revenue, expected to be recognized in the future, period (Year)	9 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
Service Revenue [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Service revenue, expected to be recognized in the future	$ 808
Service revenue, expected to be recognized in the future, period (Year)	1 year