Note 5 - Fair Value of Financial Instruments - Assets Measured on Recurring Basis (Details) - USD ($)
|
Jun. 30, 2021 |
Mar. 31, 2021 |
| Total |
$ 62,756,448
|
$ 64,860,822
|
| Money Market Funds [Member] |
|
|
| Total |
8,231,700
|
10,143,196
|
| Corporate Bond Securities [Member] |
|
|
| Total |
54,524,748
|
54,717,626
|
| Fair Value, Recurring [Member] |
|
|
| Total |
62,756,448
|
64,860,822
|
| Fair Value, Recurring [Member] | Money Market Funds [Member] |
|
|
| Total |
8,231,700
|
10,143,196
|
| Fair Value, Recurring [Member] | Corporate Bond Securities [Member] |
|
|
| Total |
54,524,748
|
54,717,626
|
| Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |
|
|
| Total |
8,231,700
|
10,143,196
|
| Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member] |
|
|
| Total |
8,231,700
|
10,143,196
|
| Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Corporate Bond Securities [Member] |
|
|
| Total |
0
|
0
|
| Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |
|
|
| Total |
54,524,748
|
54,717,626
|
| Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Money Market Funds [Member] |
|
|
| Total |
0
|
0
|
| Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Corporate Bond Securities [Member] |
|
|
| Total |
$ 54,524,748
|
$ 54,717,626
|