Sounds like your out of luck. Lecture notes only exports as pdf or picture. The notes are not in a text format to export... they are litteraly drawings.
You either stay with Lecture Notes or move to an app with picture import ability.
Sent from my Full CM9 on ThinkPad Tablet using XDA
SCH-I605 - Rooted / Bootloader unlocked / CWR / CM 10.1 Nightlies
ASUS TF101 - Stock Test device
Kindle Fire - Stock Test device
Free Lander PD10 Deluxe
In the graveyard:
Lenovo Thinkpad Tablet - Rooted - Sold to by SCH-I605
Moto DroidX2 - Rooted / CM7 Unofficial
Moto Droid - Rooted