Note 7 - Intangible Assets, Net

Intangible assets, net, consists of the following (in thousands):

The following table represents the total estimated amortization of intangible assets for the five succeeding years and thereafter as of June 30, 2023 (in thousands):

For the three months ended June 30, 2023 and 2022, amortization expense was approximately $0.1 million and $0.1 million, respectively. For the six months ended June 30, 2023 and 2022, amortization expense was approximately $0.1 million and $0.1 million, respectively.