Back on topic....
I do not have a manual for a Jodel 150 to hand but for a Jodel 1050 the maximum demonstrated take off and landing is 10knots. Maximum demonstrated taxi is 20 knots.
Quite correctly, as it is a 'demonstration' not a limitation, the data appears in section III "Handling' of the flight manual.
I can not imagine the 150 will be much different.
Hope that helps.