Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 581	$ 890
Unamortized discount, current maturities	$ 250	38
Imputed interest rate (percent)	6.60%
Unamortized discount, noncurrent maturities	$ 758	$ 117
Common Stock
Par value (in USD per share)	$ 0.0001	$ 0.0001
Shares authorized	50,000,000	50,000,000
Shares issued	15,746,288	15,249,118
Shares outstanding	15,746,288	15,249,118