Note 13 - Income Taxes - Reconciliation of Unrecognized Tax Benefits (Details) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Balance	$ 4,150,000
Deferred Tax Assets [Member]
Balance	5,649,000	$ 4,754,000	$ 5,455,000
Additions based on tax positions related to the current year	835,000	1,454,000	636,000
Additions (reductions) for tax positions of prior years	(1,380,000)	(198,000)	(1,097,000)
Reductions for statute of limitation expirations	(232,000)	(361,000)	(240,000)
Balance	4,872,000	5,649,000	4,754,000
Liability for Unrecognized Tax Benefits [Member]
Balance	9,253,000	8,505,000	8,902,000
Additions based on tax positions related to the current year	835,000	1,454,000	636,000
Additions (reductions) for tax positions of prior years	(1,097,000)	324,000	(273,000)
Reductions for statute of limitation expirations	(592,000)	(1,030,000)	(760,000)
Balance	8,399,000	9,253,000	8,505,000
Liability for Interest and Penalties [Member]
Balance	3,438,000	2,678,000	2,290,000
Additions based on tax positions related to the current year	0	0	0
Additions (reductions) for tax positions of prior years	859,000	1,583,000	900,000
Reductions for statute of limitation expirations	(572,000)	(823,000)	(512,000)
Balance	3,725,000	3,438,000	2,678,000
Total Liability [Member]
Balance	12,691,000	11,183,000	11,192,000
Additions based on tax positions related to the current year	835,000	1,454,000	636,000
Additions (reductions) for tax positions of prior years	(238,000)	1,907,000	627,000
Reductions for statute of limitation expirations	(1,164,000)	(1,853,000)	(1,272,000)
Balance	$ 12,124,000	$ 12,691,000	$ 11,183,000