Note 15 - Income Taxes (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Unrecognized Tax Benefits, Period Increase (Decrease), Total	$ (1,469,000)
Effective Income Tax Rate Reconciliation, Benefit Resulting from Expiration of Applicable Statute Limitations, Amount	1,901,000	$ 2,366,000	$ 2,064,000
Unrecognized Tax Benefits, Ending Balance	3,940,000
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit	1,213,000
Income Tax Examination, Penalties and Interest Expense, Total	$ (324,000)	(695,000)	38,000
Open Tax Year	2018 2019 2020 2021
Liability for Interest and Penalties [Member]
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations	$ 867,000	1,098,000	935,000
Unrecognized Tax Benefits, Ending Balance	$ 2,290,000	$ 2,614,000	$ 3,309,000	$ 3,271,000