Note 13 - Related Party Transactions (Details Textual) - USD ($) $ in Thousands, shares in Millions		12 Months Ended
	Jun. 10, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Ownership Interest, Shares Sold By Related Party Entity (in shares)	3.3
Related Party Transaction, Amounts of Transaction		$ 0	$ 1,500	$ 700