If you mined $25 worth of bitcoin last year, do you still need to file taxes?

$25 (cost-basis) worth of what I would call "hobbyist self-employment" income which the IRS now considers "property" according to yesterday's statement they put out. The conversations I'm hearing is that the amount is still "taxable," but you wouldn't be required to file a Schedule C or SE if the cost-basis amount is less than $400. I had no other income because I was going to school. I don't have access to utility bills and the mining hardware is nearly 5 years old -- so registering as an LLC and write offs for me would be significantly time-consuming and highly impracticable.

I know this will be a headache when I decide to sell, so I'm in the process of gathering trade and past market fair-value data -- without tools right now it's extremely time-consuming.