AstroNova, Inc. (NASDAQ:ALOT) shares have had a horrible month, losing 29% after a relatively good period beforehand. Instead of being rewarded, shareholders who have already held through the last twelve months are now sitting on a 30% share price drop.

Although its price has dipped substantially, AstroNova's price-to-earnings (or "P/E") ratio of 23.6x might still make it look like a sell right now compared to the market in the United States, where around half of the companies have P/E ratios below 18x and even P/E's below 10x are quite common. Although, it's not wise to just take the P/E at face value as there may be an explanation why it's as high as it is.

AstroNova has been doing a good job lately as it's been growing earnings at a solid pace. One possibility is that the P/E is high because investors think this respectable earnings growth will be enough to outperform the broader market in the near future. If not, then existing shareholders may be a little nervous about the viability of the share price.

Does Growth Match The High P/E?

The only time you'd be truly comfortable seeing a P/E as high as AstroNova's is when the company's growth is on track to outshine the market.

Taking a look back first, we see that the company managed to grow earnings per share by a handy 10% last year. However, this wasn't enough as the latest three year period has seen an unpleasant 55% overall drop in EPS. So unfortunately, we have to acknowledge that the company has not done a great job of growing earnings over that time.

Weighing that medium-term earnings trajectory against the broader market's one-year forecast for expansion of 15% shows it's an unpleasant look.

In light of this, it's alarming that AstroNova's P/E sits above the majority of other companies. Apparently many investors in the company are way more bullish than recent times would indicate and aren't willing to let go of their stock at any price. Only the boldest would assume these prices are sustainable as a continuation of recent earnings trends is likely to weigh heavily on the share price eventually.

The Bottom Line On AstroNova's P/E

There's still some solid strength behind AstroNova's P/E, if not its share price lately. We'd say the price-to-earnings ratio's power isn't primarily as a valuation instrument but rather to gauge current investor sentiment and future expectations.

Our examination of AstroNova revealed its shrinking earnings over the medium-term aren't impacting its high P/E anywhere near as much as we would have predicted, given the market is set to grow. When we see earnings heading backwards and underperforming the market forecasts, we suspect the share price is at risk of declining, sending the high P/E lower. Unless the recent medium-term conditions improve markedly, it's very challenging to accept these prices as being reasonable.

You should always think about risks. Case in point, we've spotted 3 warning signs for AstroNova you should be aware of, and 1 of them makes us a bit uncomfortable.

It's important to make sure you look for a great company, not just the first idea you come across. So take a peek at this free list of interesting companies with strong recent earnings growth (and a low P/E).

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