9. Share-based Compensation - Option activity (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Number of Shares
Outstanding at end of year, Shares	1,390,770
Wtd. Avg Exercise Price
Outstanding at end of year	$ 1.50
Common stock options
Number of Shares
Outstanding at beginning of year, Shares	1,417,309	1,452,082
Granted, Shares	95,000	21,427
Exercised, Shares	(68,520)	(25,419)
Forfeited, Shares	(49,895)	(29,001)
Expired, Shares	$ (3,124)	$ (1,780)
Outstanding at end of year, Shares	1,390,770	1,417,309
Stock options exercisable at end of year, Shares	1,225,358	1,177,588
Wtd. Avg Exercise Price
Outstanding at beginning of year	$ 1.36	$ 1.24
Granted, Wtd. Avg. Shares Exercise Price	$ 3.36	$ 9.67
Exercised, Wtd. Avg. Shares Exercise Price	$ 1.22	$ 1.00
Forfeited, Wtd. Avg. Shares Exercise Price	$ 1.51	$ 1.56
Expired, Wtd. Avg. Shares Exercise Price	$ 2.23	$ 1.12
Outstanding at end of year	$ 1.50	$ 1.36
Stock options exercisable at end of year, Wtd. Avg. Shares Exercise Price	$ 1.33	$ 1.19