Note 7 - Affiliate Balances - Amounts Due to Affiliate (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2020 USD ($)
Due to Sonatide at December 31, 2019	$ 50,186
Total due to Sonatide at September 30, 2020	53,355
Sonatide [Member]
Due to Sonatide at December 31, 2019	31,475
Plus additional commissions payable to Sonatide	3,240
Plus amounts paid by Sonatide on behalf of the company	6,763
Less amounts used to offset due from Sonatide obligations (A)	(8,145)	[1]
Other	(43)
Total due to Sonatide at September 30, 2020	$ 33,290

[1] We reduced the respective due from affiliates and due to affiliates balances each period through netting transactions based on agreement with the joint venture.