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Note 18 - Revenues - Changes in Deferred Revenue (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Balance | $ 3,820 | $ 505
Deferral of revenue | 3,247 | 5,515
Recognition of deferred revenue | (3,127) | (5,161)
Effect of foreign currency translation | 9 | (15)
Balance | 3,949 | 3,820
Addition due to business combination |  | 2,976
Service [Member] |  |
Balance | 1,659 | 505
Deferral of revenue | 2,152 | 4,305
Recognition of deferred revenue | (2,233) | (3,984)
Effect of foreign currency translation | 9 | (15)
Balance | 1,587 | 1,659
Addition due to business combination |  | 848
Customer Advances [Member] |  |
Balance | 2,161 |
Deferral of revenue | 1,095 | 1,210
Recognition of deferred revenue | (894) | (1,177)
Effect of foreign currency translation |  |
Balance | $ 2,362 | 2,161
Addition due to business combination |  | $ 2,128

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