Note 12 - Leases - Operating Leases Balance Sheet Information (Details) - USD ($) $ in Thousands		Dec. 31, 2020	Dec. 31, 2019
Noncurrent operating lease liabilities		$ 411	$ 649
Other Noncurrent Assets [Member]
Other noncurrent assets (a)	[1]	918	1,178
Accrued and Other Current Liabilities [Member]
Accrued and other current liabilities		507	529
Other Noncurrent Liabilities [Member]
Noncurrent operating lease liabilities		411	649
Other Liabilities [Member]
Total liabilities		$ 918	$ 1,178

[1] Operating lease asset balances at December 31, 2020 and 2019.