Note 6 - Accrued Expenses and Other Long-term Liabilities - Other Long-term Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Acquisition-related liabilities	$ 1,326	$ 127
Deferred rent	530	561
Income taxes	559	321
Other	196	179
Total	$ 2,611	$ 1,188