Note 9 - Fair Value Measurements (Details Textual) - USD ($) |
Jun. 30, 2016 |
Mar. 31, 2016 |
|---|---|---|
| Fair Value, Inputs, Level 1 [Member] | ||
| Available-for-sale Securities | $ 89,393,316 | $ 84,045,869 |
| Fair Value, Inputs, Level 2 [Member] | ||
| Available-for-sale Securities | $ 1,337,278 | $ 1,346,850 |