Note M - Income Taxes - Schedule of Reconciliation of Difference Between Benefit for Income Taxes and Income Taxes at Statutory U.S. Federal Income Tax Rate (Details) |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Federal statutory rate | 34.00% | 34.00% | 34.00% |
| Change in valuation allowance | (69.31%) | (19.25%) | (32.88%) |
| Return to provision and deferred true-up | (23.83%) | 0.36% | |
| Change in rate | (14.63%) | ||
| State tax benefit (net of federal) | 15.64% | 4.06% | 5.96% |
| Warrant liability | 68.44% | (15.28%) | (9.39%) |
| Amortization | (3.15%) | ||
| Conversion feature and put option on 2013 convertible notes | (1.68%) | (1.26%) | |
| Interest expense | 0.21% | ||
| Stock-based compensation | (12.71%) | (1.28%) | |
| Other | (0.10%) | (1.42%) | (0.29%) |
| Federal income tax provision effective rate | 0.09% | 0.02% | 0.09% |
| State and Local Jurisdiction [Member] | |||
| State research and development credit | 0.09% | 0.03% | 0.09% |
| Domestic Tax Authority [Member] | |||
| State research and development credit | 5.65% | 0.84% | 3.29% |