Renewing Lease in CA, can I ask tenant financial questions?

[Eran G.]

I have a tenant whose lease is up for renewal and the property is California.  The tenant has been great thus far (he has lived in my property almost 12 months) but works for a large clothing retail company and retail is doing horribly right now.  I am obviously nervous about renewing a 12-month lease during these uncertain times and I would like to ask the tenant his existing financial viability and job security.  

First of all, is it legal of me to ask questions about his savings, income, and job security prior to renewing the lease?  If it is legal, should I just ask in a conversation his financial well-being or should I ask to see documentation of bank statements for savings or income?  We already went through all this when the tenant signed up nearly a year ago but I don't know the legality of asking such questions after the lease has been signed, even if it was a year ago.

Also, with moratoriums on evictions in most states and California being one of the most tenant-friendly states out there, would it be wise of me to have the tenant sign a 3 or 6 month lease and constantly renew it so as to not lock myself into quandary in the event my tenant's situation takes a nasty dive?  One concern I have using this strategy is that it makes me look poorly and could create ill will when things are otherwise going quite good right now relationship-wise.

Thank you.