Good point LoyceV, what is at stake is the current value. Back then I had high hopes for bitcoin and tried to get others interested. When the value dropped I lost interest. myself I can see I made 5 transactions but can't remember what they were. And I remembered having printed the keys and put them somewhere. When I couldn' t find it I assumed I had thrown it away. Glad I still found it. 
Is it smart to put Electrum on a thumb drive, if even possible?
Make sure you keep track of where your change goes if you just import your private key.
What do you mean by ' change'?Is it smart to put Electrum on a thumb drive, if even possible?