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Note 7 - Affiliates Balances - Amounts Due From Affiliate (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2021 USD ($)
Due from Sonatide at December 31, 2020	$ 62,050
Total due from Sonatide at June 30, 2021	64,922
Sonatide [Member]
Due from Sonatide at December 31, 2020	41,623
Revenue earned by the company through Sonatide	17,187
Less amounts received from Sonatide	(14,632)
Other	(43)
Total due from Sonatide at June 30, 2021	$ 44,135

X

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Amount of increase (decrease) in receivables due from an entity that is affiliated with the reporting entity by means of direct or indirect ownership, classified as other.

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Amount of distribution received from equity method investee for return on investment, classified as operating activities. Excludes distribution for return of investment, classified as investing activities.

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Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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