Note 3 - Net Earnings Per Share (Details)	3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended
	Sep. 30, 2013	Sep. 30, 2013	Sep. 30, 2012 Equity Option [Member]	Sep. 30, 2012 Equity Option [Member]
Note 3 - Net Earnings Per Share (Details) [Line Items]
Incremental Common Shares Attributable to Dilutive Effect of Call Options and Warrants	11,000	23,500	33,500	31,000