Note 4 - Financial Statement Details - Accounts Payable and Accrued Expenses (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Accounts payable	$ 9,115	$ 5,285
Accrued other expense	6,203	5,645
Employee liability	3,940	3,495
Bonus compensation liability	2,978	2,963
Refunds and commissions payable	2,568	1,803
Foreign currency forward contract liability	1,782	2,008
Travel certificate liability	870	870
Accrued travel insurance expense	505	270
Royalty payable	130	0
Income tax liabilities	2	2
Total accounts payable and accrued expenses	$ 28,093	$ 22,341