Note 8 - Debt (Detail) (USD $)	1 Months Ended	6 Months Ended
	Nov. 22, 2011	Dec. 31, 2012	Dec. 31, 2011
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, Interest Rate During Period		1.78%	1.89%
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)		$ 14,100,000
Funded Debt to EBITDA [Member]
Line of Credit Facility, Covenant Terms		funded debt to EBITDA, excluding non-cash and retirement benefit expenses, cannot exceed 1.45 to 1
Capital Expenditures [Member]
Line of Credit Facility, Covenant Terms		annual capital expenditures cannot exceed $15.0 million
Debt Service Coverage Ratio [Member]
Line of Credit Facility, Covenant Terms		maintain a Debt Service Coverage Rate of a minimum of 1.25 to 1
Cash and Liquid Investments Balance [Member]
Line of Credit Facility, Covenant Terms		maintain consolidated cash plus liquid investments of not less than $10.0 million