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Note 3 - Supplemental Balance Sheet Information (in Thousands) - Goodwill Rollforward (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
Balance $ 1,836
Purchase of interest in subsidiary 1,962
Change in goodwill due to impact of foreign currency 10
Balance 3,788
UNITED STATES  
Balance 1,188
Purchase of interest in subsidiary 1,962
Change in goodwill due to impact of foreign currency
Balance 3,150
International [Member]  
Balance 648
Purchase of interest in subsidiary
Change in goodwill due to impact of foreign currency 10
Balance $ 638