Note 9 - Income Taxes (Details Textual) - USD ($) |
12 Months Ended | |
|---|---|---|
Dec. 31, 2016 |
Dec. 31, 2015 |
|
| Effective Income Tax Rate Reconciliation, Percent | 1.10% | 2.60% |
| General and Administrative Expense [Member] | ||
| Income Tax Examination, Penalties and Interest Expense | $ 27,000 | $ 33,000 |
| Other Liabilities [Member] | ||
| Liability for Uncertainty in Income Taxes, Noncurrent | 40,000 | $ 66,000 |
| Domestic Tax Authority [Member] | ||
| Operating Loss Carryforwards | $ 22,613,000 | |
| Domestic Tax Authority [Member] | Latest Tax Year [Member] | ||
| Open Tax Year | 2013 | |
| State and Local Jurisdiction [Member] | ||
| Operating Loss Carryforwards | $ 24,948,000 | |
| State and Local Jurisdiction [Member] | Earliest Tax Year [Member] | ||
| Open Tax Year | 2012 | |