Note 7 - Prepaid Expenses (Tables)

6 Months Ended

Jun. 30, 2014

Prepaid Expenses And Other Assets [Abstract]

Schedule of Prepaid Expense and Other Current Assets [Table Text Block]

	June 30,		December 31,
	2014		2013
Prepaid insurance	$	81	$	292
Prepaid research and development expenses		2,894		3,218
Other prepaid expenses		34		88
	$	3,009	$	3,598