Note 6 - Other Current Assets - Prepayments and Other Current Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Income tax receivable	$ 4,659	$ 2,510
Prepaid expense	3,878	3,528
Other	3,998	3,579
Total prepayments and other current assets	$ 12,535	$ 9,617

Amount of asset related to consideration paid in advance for costs that provide economic benefits within a future period of one year or the normal operating cycle, if longer.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant