Note 2 - Summary of Significant Accounting Policies - Reconciliation of Cash, Cash Equivalents, and Restricted Cash (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019
Cash and cash equivalents	$ 9,418	$ 10,914	$ 12,850
Restricted cash included in current assets	2,025	2,080	988
Restricted cash included in long-term assets	367	$ 507	1,494
Total cash, cash equivalents, and restricted cash shown in the Consolidated Statements of Cash Flows	$ 11,810		$ 15,332