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Note 4 - Marketable Securities (Tables) | 3 Months Ended
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Jun. 30, 2013
Table Text Block [Abstract] |
Schedule of Available-for-sale Securities Reconciliation [Table Text Block] |
|  | Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Market Value |
June 30, 2013 |  | $ | 10,987 |  |  | $ | 412 |  |  | $ | - |  |  | $ | 11,399 |
March 31, 2013 |  | $ | 11,768 |  |  | $ | 539 |  |  | $ | 1 |  |  | $ | 12,307 |
Investments Classified by Contractual Maturity Date [Table Text Block] |
Fair value of Municipal Bonds |  | Total |  |  | Less than 1 Year |  |  | 1 – 5 Years |  |  | 5 – 10 Years |  |  | After 10 Years |
June 30, 2013 |  | $ | 11,399 |  |  | $ | 2,155 |  |  | $ | 8,026 |  |  | $ | 1,218 |  |  | $ | - |

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- Definition Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments. + References No definition available. + Details
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- Definition Tabular disclosure of the reconciliation of available-for-sale securities from cost basis to fair value. + References No definition available. + Details
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