Note 9 - Income Taxes - Uncertain Tax Benefits (Details) - USD ($) |
12 Months Ended | |
|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
|
| Uncertain tax benefit, tax | $ 13,200 | $ 32,600 |
| Gross increases - tax positions in prior period | ||
| Gross decreases - tax positions in prior period | (13,200) | (19,400) |
| Uncertain tax benefit, tax | 13,200 | |
| Uncertain tax benefit, interest and penalties | 26,800 | 33,000 |
| Gross increases - tax positions in prior period | ||
| Gross decreases - tax positions in prior period | (26,800) | (6,200) |
| Uncertain tax benefit, interest and penalties | $ 26,800 | |
| X | ||||||||||
- Definition Amount of decrease in unrecognized tax benefits interest and penalties resulting from tax positions taken in prior period tax returns. No definition available.
|
| X | ||||||||||
- Definition The amount of estimated penalties and interest accrued as of the balance sheet date arising from income tax examinations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of unrecognized tax benefits. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of expense for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|