Note 12. Income Taxes (Details 1) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Federal statutory tax rate	34.00%	34.00%
Federal statutory tax rate, amount	$ 681	$ 687
State tax rate	1.00%	3.30%
State tax rate, amount	$ 21	$ 66
Permanent difference - stock-based compensation	(7.80%)	1.60%
Permanent difference - stock-based compensation, amount	$ (156)	$ 32
Permanent difference - other	3.10%	3.30%
Permanent difference - other, amount	$ 63	$ 67
Tax reform deferred re-measurement	(17.50%)	0.00%
Tax reform deferred re-measurement, amount	$ (351)	$ 0
Provision to return	(0.10%)	(0.40%)
Provision to return, amount	$ (3)	$ (8)
Change in unrecognized tax benefits	0.00%	(2.80%)
Change in unrecognized tax benefits, amount	$ 0	$ (58)
Foreign rate differential	(2.00%)	(2.60%)
Foreign rate differential, amount	$ (41)	$ (52)
Research and development credit	(3.50%)	(2.80%)
Research and development credit, amount	$ (70)	$ (56)
Subtotal	7.20%	33.60%
Subtotal, amount	$ 144	$ 678
Change in valuation allowance	(0.70%)	(10.60%)
Change in valuation allowance, amount	$ (13)	$ (214)
Total	6.50%	23.00%
Total, amount	$ 131	$ 464