Simple matter: CDN working in US

[meaculpa]

Hi guys. Some facts:

-Canadian citizen. No relationship to US.
-In 2011 I worked 100% in Canada. Did a couple contracts as self-employed for two different companies.
-The total amount earned was about $10k USD.
-I was paid in USD, with the monies sent directly to my Canadian bank account.

I understand that I only pay taxes to the Canadian CRA, but wanted to confirm. Do I pay anything to the IRS? Do I file any forms with the IRS?

Thanks for all your help!