Note 5 - Marketable Securities (Details Textual) |
3 Months Ended | 12 Months Ended |
|---|---|---|
|
Jun. 30, 2015
USD ($)
|
Mar. 31, 2015
USD ($)
|
|
| Corporate Bond Securities [Member] | ||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss | $ 36,779 | $ 16,371 |
| Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | $ 2,595,544 | 2,590,240 |
| Number of Corporate Bonds Resulted in Loss | 6 | |
| Number of Corporate Bonds | 30 | |
| Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss | $ 36,779 | 16,371 |
| Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | $ 2,595,544 | $ 2,590,240 |
| Severity of Unrealized Loss, Percentage of Adjusted Cost | 1.00% |