Note 9 - Income Taxes - Uncertain Tax Benefits (Details) - USD ($) |
12 Months Ended | |
|---|---|---|
Dec. 31, 2016 |
Dec. 31, 2015 |
|
| Uncertain tax benefit, tax | $ 32,600 | $ 91,700 |
| Uncertain tax benefit, interest and penalties | 33,000 | 30,000 |
| Gross increases - tax positions in prior period | ||
| Gross increases - tax positions in prior period | 3,000 | |
| Gross decreases - tax positions in prior period | (19,400) | (59,100) |
| Gross decreases - tax positions in prior period | (6,200) | |
| Uncertain tax benefit, tax | 13,200 | 32,600 |
| Uncertain tax benefit, interest and penalties | $ 26,800 | $ 33,000 |