Note 7 - Debt (Detail) (USD $)	1 Months Ended	9 Months Ended		0 Months Ended
	Nov. 22, 2011	Mar. 31, 2013	Mar. 31, 2012	May 09, 2013 Subsequent Event [Member] Funded Debt to EBITDA [Member]	Sep. 07, 2012 Funded Debt to EBITDA [Member]	Sep. 07, 2012 Capital Expenditures [Member]	Sep. 07, 2012 Debt Service Coverage Ratio [Member]	Sep. 07, 2012 Cash and Liquid Investments Balance [Member]
Line of Credit Facility, Maximum Borrowing Capacity (in Dollars)		$ 23,000,000
Debt Instrument, Basis Spread on Variable Rate		1.50%
Line of Credit Facility, Covenant Terms				current funded debt to EBITDA ratio from 1.45 to 1, to 2.25 to 1 for the fourth quarter of fiscal 2013 and the first quarter of fiscal 2014.Thereafter, and through the end of the agreement on April 30 of 2015, the funded debt to EBITDA covenant reverts to 1.45 to 1	funded debt to EBITDA, excluding non-cash and retirement benefit expenses ("maximum leverage"), cannot exceed 1.45 to 1	annual capital expenditures cannot exceed $15.0 million	maintain a Debt Service Coverage Rate of a minimum of 1.25 to 1	maintain consolidated cash plus liquid investments of not less than $10.0 million
Line of Credit Facility, Interest Rate During Period		1.80%	1.91%
Debt Instrument, Face Amount (in Dollars)	15,500,000
Term Loan Number of Years	10 years
Debt Instrument, Interest Rate, Stated Percentage	4.50%
Line of Credit Facility, Periodic Payment (in Dollars)	160,640
Loans Payable (in Dollars)		$ 13,800,000