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Note 2 - Summary of Accounting Policies - Reconciliation of Contingent Consideration (Details) - USD ($)
$ in Thousands
 12 Months Ended
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.