Profit is down and so is share price - but the overall market has been falling so it is dragging most stocks down. Two observations:

1/ NAN used to be the darling of shortsellers and day traders few years back. That time is over and it seems it might be coming back - see the attached chart

2/ Directors have been buying at the level of $6 which means that is where they price it, but they have positive bias. Market might not be so nice to them.

My straw: I do not know have enough industry information to recommend but based on the two observations above I see buying opportunity between $5 and $5.50 when it falls there, after that the inflation kicks it up. However, if shortselling kicks in the price will be going sideways for a while...

Disclaimer: I have never held NAN.