Note 7 - Stock-based Compensation (Details Textual) - USD ($) |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2015 |
Sep. 30, 2014 |
Sep. 30, 2015 |
Sep. 30, 2014 |
|
| Non-employee Director Stock Options [Member] | ||||
| Allocated Share-based Compensation Expense | $ 21,160 | $ 58,960 | $ 21,160 | $ 58,960 |