Note 7 - Accounts Receivable, Net - Summary of Accounts Receivable (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Gross accounts receivable	$ 2,426	$ 2,917
Allowance for uncollectible accounts	(1,677)	(1,802)
Total accounts receivable, net	$ 749	$ 1,115