Note 5 - Goodwill and Other Intangible Assets - Acquired Intangible Assets by Major Class (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Total net book value	$ 29,484	$ 39,790	$ 50,409
Balances, December 31, 2021	39,790	50,409
Acquisition of customer relationship	528	782
Additions to/(disposals from) domain portfolio, net	(5)	(7)
Amortization expense	(10,829)	(11,394)	(10,007)
Amortization expense	(10,829)	(11,394)	(10,007)
Balances December 31, 2022	29,484	39,790	50,409
Surname Domain Names [Member]
Gross carrying value	11,151	11,155
Total net book value	11,151	11,155	11,156
Balances, December 31, 2021	11,155	11,156
Additions to/(disposals from) domain portfolio, net	(4)	(1)
Amortization expense	0
Amortization expense	0
Balances December 31, 2022	11,151	11,155	11,156
Direct Navigation Domain Names [Member]
Gross carrying value	1,128	1,129
Total net book value	1,128	1,129	1,135
Balances, December 31, 2021	1,129	1,135
Additions to/(disposals from) domain portfolio, net	(1)	(6)
Amortization expense	0
Amortization expense	0
Balances December 31, 2022	1,128	1,129	1,135
Brand [Member]
Gross carrying value	15,764	15,764
Accumulated amortization	14,894	12,824
Total net book value	870	2,940	5,010
Balances, December 31, 2021	2,940	5,010
Additions to/(disposals from) domain portfolio, net	0	0
Amortization expense	(2,070)	(2,070)
Amortization expense	(2,070)	(2,070)
Balances December 31, 2022	870	2,940	5,010
Customer Relationships [Member]
Gross carrying value	65,892	65,463
Accumulated amortization	52,589	44,650
Total net book value	13,303	20,813	28,634
Balances, December 31, 2021	20,813	28,634
Acquisition of customer relationship	528	782
Additions to/(disposals from) domain portfolio, net	0	0
Amortization expense	(8,038)	(8,603)
Amortization expense	(8,038)	(8,603)
Balances December 31, 2022	13,303	20,813	28,634
Technology-Based Intangible Assets [Member]
Gross carrying value	10,157	10,157
Accumulated amortization	8,009	7,387
Total net book value	2,148	2,770	3,392
Balances, December 31, 2021	2,770	3,392
Additions to/(disposals from) domain portfolio, net	0	0
Amortization expense	(622)	(622)
Amortization expense	(622)	(622)
Balances December 31, 2022	2,148	2,770	3,392
Network Rights [Member]
Gross carrying value	1,515	1,515
Accumulated amortization	631	532
Total net book value	884	983	1,082
Balances, December 31, 2021	983	1,082
Additions to/(disposals from) domain portfolio, net	0	0
Amortization expense	(99)	(99)
Amortization expense	(99)	(99)
Balances December 31, 2022	$ 884	$ 983	$ 1,082

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
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Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition.

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Amount before accumulated amortization of intangible assets, excluding goodwill.

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Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

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