Note 16 - Commitments and Contingencies (Details Textual) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Value of Open Purchase Orders	$ 14,977
Indemnification Agreement [Member]
Loss Contingency Accrual, Ending Balance	0	$ 0
Mask [Member]
Purchase Obligation, Total	$ 542