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Note 11 - Sale/Leaseback (Detail) (USD $)
3 Months Ended 4 Months Ended 60 Months Ended 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
May 24, 2011
May 31, 2021
May 31, 2016
May 31, 2012
Minimum [Member]
May 31, 2012
Maximum [Member]
Sale Leaseback Transaction, Gross Proceeds     $ 1,200,000        
Sale Leaseback Transaction, Lease Terms     seven        
Renewal Terms         5 years    
Sale Leaseback Transaction, Annual Rental Payments       156,000   135,000 145,000
Sale Leaseback Transaction, Other Payments Required     80,000        
Sale Leaseback Transaction, Net Proceeds     1,120,000        
Sale Leaseback Transaction, Net Book Value     303,000        
Sale Leaseback Transaction, Cumulative Gain Recognized     817,000        
Sale Leaseback Transaction, Current Period Gain Recognized $ 29,000 $ 29,000