Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) |
Jun. 30, 2015 |
Mar. 31, 2015 |
|---|---|---|
| Allowance for uncollectible accounts | $ 15,000 | $ 15,000 |
| Common stock, par value (in dollars per share) | $ 0.01 | $ 0.01 |
| Common stock, shares authorized (in shares) | 6,000,000 | 6,000,000 |
| Common stock, shares issued (in shares) | 4,866,181 | 4,857,953 |
| Common stock, shares outstanding (in shares) | 4,866,181 | 4,857,953 |