Note 15 - Commitments and Contingencies - Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Balance at beginning of period	$ 127	$ 190
Bad debt expense	130	(30)
Write-offs	(47)
Other adjustments	(36)
Balance at end of period	$ 174	$ 160