Income Taxes (Deferred Income Taxes) (Details) - USD ($) |
Dec. 31, 2015 |
Dec. 31, 2014 |
|---|---|---|
| Current deferred tax assets: | ||
| Inventories | $ 93,600 | $ 188,300 |
| Bad debt reserve | 23,700 | 65,200 |
| Accrued expenses | 0 | 25,100 |
| Total current deferred tax assets | 117,300 | 278,600 |
| Long-term deferred tax assets: | ||
| Net operating loss carryforwards | 3,221,000 | 2,982,100 |
| Foreign net operating loss carryforwards | 0 | 291,100 |
| Federal and state tax credit carryforward | 608,000 | 421,700 |
| Patents and intangibles | 68,100 | 73,000 |
| Stock compensation | 89,800 | 89,700 |
| Other long term | 45,500 | 142,100 |
| Total long-term deferred tax assets | 4,032,400 | 3,999,700 |
| Total deferred tax assets | 4,149,700 | 4,278,300 |
| Current deferred tax liabilities: | ||
| Prepaid expenses | (64,600) | (59,900) |
| Long-term deferred tax liabilities: | ||
| Property, plant and equipment | (612,800) | (976,400) |
| Total deferred tax liabilities | (677,400) | (1,036,300) |
| Deferred tax valuation allowance | (3,472,300) | (3,242,000) |
| Net deferred tax assets (liabilities) | $ 0 | $ 0 |