Note 9 - Promissory Notes (Tables)

6 Months Ended

Jun. 30, 2014

Debt Disclosure [Abstract]

Schedule of Maturities of Long-term Debt [Table Text Block]

2014	$	—
2015		735
2016		1,887
2017		2,074
2018		1,604
Total	$	6,300

Contractual Interest Expense and Amortization of Debt Issuance Costs and Debt Discount [Table Text Block]

		Three Months Ended June 30,				Six Months Ended June 30,
		2014		2013		2014		2013
Simple interest	$	92	$	224	$	215	$	482
Accretion of debt discount		55		99		123		208
Amortization of promissory notes issuance costs		21		29		38		61
	$	168	$	352	$	376	$	751