Looks to be a rather good result :- growth accelerated at + 56 %...

Looks to be a rather good result :
- growth accelerated at + 56 % yoy vs + 38 % yoy during Q3,
- another good level of cash flow (2.1 m$) and free cash flow (1.7 m$), confirming that Q3 was not a one off.
Based on this free cash flow annualised, the company has a free cash flow yield of 10 % (at 0.40 $), quite high given the growth of the business.

For me, the only question is about the EBITDA margin which decreased to 7 % vs 12.4 % for Q3.
Would be interested to understand the main reasons behind this decrease.
Not sure to understand it while their high margin business (water technology) had another strong top line growth (+ 131 % yoy during Q4). Perhaps due partly to a gross margin particularly high during Q3.