Note 13 - 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, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
Cash and cash equivalents	$ 10,388	$ 4,354	$ 12,982
Restricted cash	1,769		11,924
Total cash, cash equivalents and restricted cash	$ 12,157	$ 16,168	$ 24,906	$ 23,145