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Note 10 - Revenue (Details Textual) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019	Jan. 01, 2021 USD ($)
Contract with Customer, Liability, Total	$ 147,793	$ 152,245		$ 152,200
Customer Concentration Risk [Member] | Accounts Receivable [Member]
Number of Customers	1	1	0
Customer Concentration Risk [Member] | Accounts Receivable [Member] | One Customer [Member]
Concentration Risk, Percentage	46.00%	59.00%
Customer Concentration Risk [Member] | Revenue Benchmark [Member]
Number of Customers	0	0	0
Minimum [Member]
Domain Services, Purchased Term (Year)	1 year
Maximum [Member]
Domain Services, Purchased Term (Year)	10 years

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