The Statesman makes people sign in these days, but published a lengthy reminiscence of Ed Idar (the Express obit is brief and uninformative). But here's an interview. And another, about the poll tax. And yet another, about the G.I. Forum days. Nobody seems to have covered or conducted interviews about MALDEF or the later days, though. The Handbook of Texas has entries for Eduardo Idar the elder, and for Jovita Idar.