If you have more than $400 of self-employment income, then you are required to report it on your taxes. You'll file a SCH C with your personal 1040 tax return to report the income. At worst, you'll pay taxes on the amount over $400. (Medicare and Social Security, at least.)
If you claim it all as hobby income, then you can not deduct "any" expenses against it, and depending on your standard deduction you'll pay full taxes on every penny of that income.
Were I in your shoes, if your income puts you in the 12% or higher tax bracket, I wouldn't bother with a SCH C for such a little amount of self employment income. I'd just report it as hobby income to keep things simple and be done with it.
