Note 4 - Marketable Securities (Tables)

3 Months Ended

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	$	-