"Little Women" was a favorite of my mother's, and became a favorite book and film for me. The March sisters and Marmee are chock-a-block with positive traits. Marmee, in particular, isn't shy about delivering wise messages, such as that wealth and beauty can't beat self-respect, selfishness is a vice, physical punishment is the easy way out, and gender roles shouldn't confine someone to societal expectations. However, nobody in this film is preachy. Instead, this all comes across as a pro-family, pro-feminine slice of life. As for the male characters: Dad is loved and feels his daughters' pride, Professor Baher is a wise mentor and friend, as well as love interest, to Jo, and Laurie, though flawed, grows up gradually and realistically.
The major caveat here comes from Beth; her illness and death will likely disturb young viewers. It's implied that Laurie has a wild streak, which he indulges. A few minor characters drink and/or smoke. Amy's teacher hits her (not shown onscreen, but we do see the results). For whoever is prepared for these, though, the March women are well worth getting to know.