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Note 2 - Summary of Accounting Policies - Reconciliation of Contingent Consideration (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Beginning balance, January 1, 2021 |  | $ 5,888 |  |
Present value interest accretion |  | 862 |  |
Payments |  | (3,750) | $ (4,000) | $ (5,550)
Ending balance, December 31, 2021 |  | 146,759 | 5,888 |
Contingent Consideration Liability [Member] |  |  |  |
Beginning balance, January 1, 2021 |  | 5,888 |  |
Purchase price contingent consideration (1) | [1] | 149,761 |  |
Changes in fair value |  | (6,002) |  |
Payments |  | (3,750) |  |
Ending balance, December 31, 2021 |  | $ 146,759 | $ 5,888 |
[1] | The increase in the contingent consideration liability is due to the contingent consideration associated with the acquisitions of Chilicon, Off Grid Energy, and ecobee. Refer to Note 3, "Acquisitions," to the consolidated financial statements for further information.

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