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Note 2 - Supplemental Balance Sheet Information - Goodwill Attributable to Reporting Units (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Goodwill $ 780 $ 780
Facilities Segment [Member]    
Goodwill 643 643
System Integration Services Segment [Member]    
Goodwill $ 137 $ 137