Note 4 - Financial Statement Details - Accounts Payable and Accrued Expenses (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Accounts payable	$ 11,545	$ 9,326
Accrued other expense	9,323	11,851
Employee liability	2,979	2,943
Bonus compensation liability	1,985	5,195
Royalty payable	1,417	1,005
Income tax liabilities	1,817	576
Travel certificate liability	882	1,088
Refunds and commissions payable	801	1,533
Accrued travel insurance expense	427	427
Total accounts payable and accrued expenses	$ 31,176	$ 33,944