Note 5 - Marketable Securities (Details Textual)
|
9 Months Ended |
12 Months Ended |
|
Dec. 31, 2015
USD ($)
|
Mar. 31, 2015
USD ($)
|
| Corporate Bond Securities [Member] | Maximum [Member] |
|
|
| Severity of Unrealized Loss, Percentage of Adjusted Cost |
1.00%
|
|
| Corporate Bond Securities [Member] |
|
|
| Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year |
1
|
|
| Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss |
$ 153,811
|
$ 16,371
|
| Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |
$ 2,583,664
|
2,590,240
|
| Number of Other-than-temporarily Impaired Marketable Securities |
0
|
|
| Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss |
$ 153,811
|
16,371
|
| Number of Corporate Bonds Resulted in Loss |
13
|
|
| Number of Corporate Bonds |
28
|
|
| Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |
$ 2,583,664
|
$ 2,590,240
|