Note 5 - Accounts Receivable, Net - Activity for the Allowance for Uncollectible Accounts Receivable (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Balance at beginning of period	$ (88)
Provision for bad debt expense	(36)	(88)
Write-off	8
Balance at end of period	$ (116)	$ (88)