Note 2 - Acquisitions	3 Months Ended
Mar. 31, 2024
Notes to Financial Statements
Business Combination Disclosure [Text Block]	2. Acquisitions **Fiscal 2023* Acquisitions*** On February 1, 2023, the Company acquired REFUstor, headquartered in Pfullingen, Germany. REFUstor is a developer and supplier of battery storage hardware products, advanced software, and platform services for the commercial and industrial energy storage market. The Company recorded its preliminary purchase price allocation for REFUstor during the first quarter of 2023, based on its estimates of the fair value of the acquired assets and assumed liabilities. Purchase accounting for REFUstor was finalized in the first quarter of 2024 and did not result in material adjustments to the Company's preliminary estimates. The accompanying condensed consolidated financial statements include the results of REFUstor from the date of acquisition through March 31, 2024. Pro forma and other financial information are not presented as the effects of the REFUstor acquisition are not material to the Company's results of operations or financial position prior to the acquisition date.

Note 2 - Acquisitions

3 Months Ended

Mar. 31, 2024

Business Combination Disclosure [Text Block]

2. Acquisitions

Fiscal 2023 Acquisitions

On February 1, 2023, the Company acquired REFUstor, headquartered in Pfullingen, Germany. REFUstor is a developer and supplier of battery storage hardware products, advanced software, and platform services for the commercial and industrial energy storage market.

The Company recorded its preliminary purchase price allocation for REFUstor during the first quarter of 2023, based on its estimates of the fair value of the acquired assets and assumed liabilities. Purchase accounting for REFUstor was finalized in the first quarter of 2024 and did not result in material adjustments to the Company's preliminary estimates. The accompanying condensed consolidated financial statements include the results of REFUstor from the date of acquisition through March 31, 2024. Pro forma and other financial information are not presented as the effects of the REFUstor acquisition are not material to the Company's results of operations or financial position prior to the acquisition date.