Very significant. Especially considering that A/R was up some 150% during the past 5 years. In 2011 they were ramping up fast (new factory) so that's why it was up 20%.
In Q1 2016 they were already having some problems collecting. And they had to repay a bank loan at the same time.
Now, the big question. How about 2017? If it is down by 10% then they should have $15M in cash or $5/share, soon. Hopefully -20%.