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Note 9 - Product Warranty Obligations - Reconciliation of Product Warranty Liability (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Balance at beginning of period |  | $ 110,338 | $ 74,758 | $ 94,213 | $ 59,218
Product warranty reserve assumed in acquisition |  | 0 | 1,085 | 0 | 1,085
Payments |  | (22,677) | (10,475) | (54,135) | (29,536)
Provision for warranty issued |  | 19,076 | 16,527 | 62,169 | 48,521
Changes in estimates for pre-existing warranties (1) | [1] | 38,571 | 1,089 | 43,061 | 3,696
Balance at end of period |  | 145,308 | 82,984 | 145,308 | 82,984
Balance at beginning of period |  | 121,898 | 100,484 | 111,647 | 89,788
Deferred revenue contracts issued |  | 10,324 | 11,105 | 31,202 | 31,304
Amortization of deferred revenue contracts |  | (5,470) | (5,014) | (16,097) | (14,517)
Balance at end of period |  | $ 126,752 | $ 106,575 | $ 126,752 | $ 106,575
[1] | Includes a specific warranty provision recorded during the third quarter of 2022 in the amount of $37,338 to address certain clean energy product warranty-related matters.

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- Definition Represents the aggregate decrease in the liability for accruals related to extended product warranties issued during the reporting period, due to amortization of deferred revenue. + References No definition available. + Details
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- Definition Amount as of the balance sheet date of the aggregate extended product warranty liability. Does not include the ending balance for the standard product warranty liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (c)(1),(c)(5) -URI https://asc.fasb.org/extlink&oid=126907703&loc=d3e12565-110249 + Details
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- Definition Amount of increase in the extended product warranty accrual from warranties issued. Excludes standard product warranties. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (c)(3) -URI https://asc.fasb.org/extlink&oid=126907703&loc=d3e12565-110249 + Details
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- Definition Amount as of the balance sheet date of the aggregate standard product warranty liability. Does not include the balance for the extended product warranty liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (c)(1),(c)(5) -URI https://asc.fasb.org/extlink&oid=126907703&loc=d3e12565-110249 + Details
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- Definition Amount of increase in the standard product warranty accrual from a business acquisition. Excludes extended product warranties. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=126907703&loc=d3e12565-110249 + Details
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- Definition Amount of decrease in the standard product warranty accrual from payments made in cash or in kind to satisfy claims under the terms of the standard product warranty. Excludes extended product warranties. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph ((c)(2)) -URI https://asc.fasb.org/extlink&oid=126907703&loc=d3e12565-110249 + Details
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- Definition Amount of increase (decrease) in the standard product warranty accrual from changes in estimates attributable to preexisting product warranties. Excludes extended product warranties. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph ((c)(4)) -URI https://asc.fasb.org/extlink&oid=126907703&loc=d3e12565-110249 + Details
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- Definition Amount of increase in the standard product warranty accrual from warranties issued. Excludes extended product warranties. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph ((c)(3)) -URI https://asc.fasb.org/extlink&oid=126907703&loc=d3e12565-110249 + Details
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