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Note 2 - Summary of Accounting Policies - Reconciliation of Contingent Consideration (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Beginning balance, January 1, 2023 |  | $ 81,533 |  |
Changes in fair value |  | (5,922) | $ (18,339) | $ (206)
Ending balance, December 31, 2023 |  | 38,937 | 81,533 |
Contingent Consideration Liability [Member] |  |  |  |
Beginning balance, January 1, 2023 |  | 81,533 |  |
Changes in fair value |  | 0 |  |
Additional contingent consideration (1) | [1] | 11,490 |  |
Payment of contingent consideration (2) | [2] | (53,786) |  |
Present value interest accretion |  | (300) |  |
Ending balance, December 31, 2023 |  | $ 38,937 | $ 81,533 |
[1] | Represents $11,490 of contingent deferred consideration for the Pramac buyout. See Note 3, "Redeemable Noncontrolling Interest".
[2] | Includes payments of $479 in cash and $44,521 in shares for the ecobee acquisition, $4,286 in shares for the Chilicon acquisition, and $4,500 in cash for the Mean Green acquisition. The payment of common stock is accounted for as a non-cash item in the consolidated statement of cash flows.

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