What was the "Idol" that Moses’ descendants served in Dan (Judges 18:30)

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There (in the city formerly called Laish) the Danites set up for
themselves the idol, and Jonathan son of Gershom, the son of Moses,
and his sons were priests for the tribe of Dan until the time of the
captivity of the land.

The question has two subsets:

1. What is the relationship of this idol to the "idol, ephod and household gods" that the Ephraimite Micah had made in Judges 17? Was it the same idol or a new one? Was it devoted to a local god or to the God of Israel?

2. Are we seeing in this passage the roots of the Golden Calf tradition at Dan? Or was the Danite idol something different from the calves erected by Jeroboam I at Dan and Bethel?