Note 18 - Accumulated Other Comprehensive Income ("AOCI") - Changes in the Components of AOCI (Details) - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2023	Jun. 30, 2022
Balance as of January 1, 2023	$ 10,581
Balance as of June 30, 2023	15,942
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member]
Balance as of January 1, 2023	10,581	$ 2,216
Other comprehensive income before reclassifications	0	4,260
Amounts reclassified from AOCI	0	0
Net current-period other comprehensive income	0	4,260
Balance as of June 30, 2023	10,581	$ 6,476
AOCI, Unrealized Gain (Loss) Related to Equity Method Investments [Member]
Balance as of January 1, 2023	0
Other comprehensive income before reclassifications	5,361
Amounts reclassified from AOCI	0
Net current-period other comprehensive income	5,361
Balance as of June 30, 2023	5,361
AOCI Attributable to Parent [Member]
Balance as of January 1, 2023	10,581
Other comprehensive income before reclassifications	5,361
Amounts reclassified from AOCI	0
Net current-period other comprehensive income	5,361
Balance as of June 30, 2023	$ 15,942

Amount, after tax, of accumulated increase (decrease) in equity from transaction and other event and circumstance from nonowner source.

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