When "pending earnings" will be available for withdrawal(Norton Crypto wallet)?

It's been one week since I'm seeing mined amount of ETH is getting accumulated into my "Total asset", but "Available asset" still continues being 0.00, and withdraw option is grayed out. I have around $9 in "Total asset" and GAS fee was around $4 at the time of withdrawal, but still "Total asset" was 0.00 and "withdraw" button was being grayed out(disabled). So, what does this mean? When I'd be eligible to withdraw this amount or when "Total assets" will get converted into "Available assets", that is withdrawable "Norton wallet" amount?

Okay thanks, I didn't know about 0.004 mark.

So, once my wallet reaches 0.004 ETH (≈20$), then withdrawable amount will be [0.004 minus GAS], isn't it? 

Then for next transaction in future would I have to pass 0.004 ETH mark again?

We have a minimum amount needed prior to being available, .004 ETH is what I believe it is currently set to.

Also you should keep your ETH in your Norton wallet until you have more, as paying a 30% fee if you moved what you have right now doesn't make good financial sense. The gas fee changes a lot, but is not related to how much ETH you wish to move. If you move $9, $90, or $900, the fee would remain the same. So right now moving your $9 for a $4 fee is expensive.