7. Income Taxes - Deferred tax asset (Details 1) - USD ($)	Dec. 31, 2015	Dec. 31, 2014
Deferred tax assets (liabilities)
Net operating loss carryforwards	$ 11,080,303	$ 10,046,713
Accrued compensation	120,344	170,161
Depreciation	21,835	14,282
Section 263a inventory adjustment	79,110	20,233
Stock-based compensation	565,349	434,740
Suspended loss of subsidiary	246,241	0
Other	25,323	22,085
Total	12,138,505	10,708,214
Less: Valuation allowance	(12,138,505)	(10,708,214)
Net deferred tax asset	$ 0	$ 0