| | | Year Ended December 31, 2016 | | Year Ended December 31, 2015 | | ||
| Tax expense at federal statutory rate | | | 34 | % | | 34 | % |
| State tax expense, net of federal tax effect | | | (1) | % | | 5 | % |
| Permanent timing differences | | | 0 | % | | 0 | % |
| Deferred income tax asset valuation allowance | | | (34) | % | | (39) | % |
| Effective income tax rate | | | (1) | % | | 0 | % |
| | | December 31, 2016 | | December 31, 2015 | | ||
| | | | | | | | |
| Inventory | | $ | 21,000 | | $ | 22,000 | |
| Inventory allowance | | | 175,000 | | | 169,000 | |
| Allowance for doubtful accounts | | | 19,000 | | | 19,000 | |
| Accrued compensation | | | 32,000 | | | 38,000 | |
| Stock based compensation | | | 230,000 | | | 236,000 | |
| Deferred wages payable | | | 28,000 | | | 22,000 | |
| Depreciation Property, Plant & Equipment | | | (12,000) | | | (15,000) | |
| Sales tax reserve | | | 5,000 | | | 15,000 | |
| Net operating loss carry-forward | | | 4,704,000 | | | 4,560,000 | |
| Total gross deferred income tax assets | | | 5,202,000 | | | 5,066,000 | |
| Less deferred income tax assets valuation allowance | | | (5,202,000) | | | (5,066,000) | |
| Net deferred income tax assets | | $ | 0 | | $ | 0 | |