Note 6 - Stock-based Compensation - Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2028	Dec. 31, 2027	Dec. 31, 2026
Total gross compensation expense	$ 54	$ 158	$ 87	$ 181
Total tax benefit associated with compensation expense	5	6	7	7
Total net compensation expense	$ 49	$ 152	$ 80	$ 174
Forecast [Member]
Total gross unrecognized compensation expense					$ 0	$ 112	$ 59

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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