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Note 3 - Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Revenue from Contract with Customer	$ 116,752	$ 118,141	$ 276,241	$ 278,198
Revenue from non-contractual arrangements	55	55	166	166
Revenue	116,752	118,141	276,241	278,198
Bill and Hold Revenue [Member]
Revenue from Contract with Customer	10,149	9,713	31,504	26,960
Revenue	10,149	9,713	31,504	26,960
Non-bill and Hold Revenue [Member]
Revenue from Contract with Customer	106,603	108,428	244,737	251,238
Revenue	106,603	108,428	244,737	251,238
Short-Term Contract with Customer [Member]
Revenue from Contract with Customer	8,291	9,762	28,318	26,052
Revenue	8,291	9,762	28,318	26,052
Long-Term Contract with Customer [Member]
Revenue from Contract with Customer	108,406	108,324	247,757	251,980
Revenue	$ 108,406	$ 108,324	$ 247,757	$ 251,980

X

- Definition

Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 340
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 924
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