Note 15 - Supplemental Cash Flow Information - Reconciliation of Cash and Cash Equivalents and Restricted Cash Reported Within the Statement of Financial Position (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018	Dec. 31, 2017
Cash and cash equivalents	$ 23,920	$ 13,351	$ 10,388
Restricted cash	1,631		1,769
Total cash, cash equivalents and restricted cash	$ 25,551	$ 14,985	$ 12,157	$ 16,168