Note 12 - Supplemental Cash Flow Information and Non-cash Activity - Reconciliation of Cash, Cash Equivalent, and Restricted Cash (Details) - USD ($) $ in Thousands		Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Cash and cash equivalents		$ 34,228	$ 37,486	$ 42,663
Total cash, cash equivalents, and restricted cash shown in consolidated statements of cash flows		36,555	$ 39,813	42,688	$ 33,118
Prepaid Expenses and Other Current Assets [Member]
Restricted cash	[1]	2,327		0
Other Noncurrent Assets [Member]
Restricted cash		$ 0		$ 25

[1] Relates to letters of credit issued during third quarter 2020, primarily in connection with the Houston office lease deposit.