Note 1 - Organization and Significant Accounting Policies - Summary of Remaining Performance Obligations 2 (Details) $ in Thousands	Dec. 31, 2022 USD ($)
Rental Revenue [Member]
Revenue, expected to be recognized in the future	$ 4,635
Service Revenue [Member]
Revenue, expected to be recognized in the future	210
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01 | Rental Revenue [Member]
Revenue, expected to be recognized in the future	$ 3,735
Revenue, expected to be recognized in the future, period (Year)	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01 | Service Revenue [Member]
Revenue, expected to be recognized in the future	$ 200
Revenue, expected to be recognized in the future, period (Year)	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01 | Rental Revenue [Member]
Revenue, expected to be recognized in the future	$ 900
Revenue, expected to be recognized in the future, period (Year)	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01 | Service Revenue [Member]
Revenue, expected to be recognized in the future	$ 10
Revenue, expected to be recognized in the future, period (Year)	1 year