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Note 2 - Supplemental Balance Sheet Information - Goodwill and Intangible Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Goodwill $ 780 $ 780
Customer Relationships [Member]    
Gross carrying amount 906 906
Accumulated amortization (622) (599)
Computer Software, Intangible Asset [Member]    
Gross carrying amount 234 234
Accumulated amortization $ (234) $ (234)