Note 8 - Employee Benefit Plans (Detail) - Weighted Average Asset Allocation by Asset Category								12 Months Ended				12 Months Ended				12 Months Ended	6 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2012 Cash and Cash Equivalents [Member] Actual Asset Allocation [Member]	Dec. 31, 2011 Cash and Cash Equivalents [Member] Actual Asset Allocation [Member]	Jun. 30, 2011 Cash and Cash Equivalents [Member] Target Allocation [Member]	Dec. 31, 2012 Equity Securities [Member] Actual Asset Allocation [Member]	Dec. 31, 2011 Equity Securities [Member] Actual Asset Allocation [Member]	Jun. 30, 2011 Equity Securities [Member] Target Allocation [Member]	Dec. 31, 2012 Equity Securities [Member]	Dec. 31, 2012 Debt Securities [Member] Actual Asset Allocation [Member]	Dec. 31, 2011 Debt Securities [Member] Actual Asset Allocation [Member]	Jun. 30, 2011 Debt Securities [Member] Target Allocation [Member]	Dec. 31, 2012 Debt Securities [Member]	Dec. 31, 2012 Equity Securities, Other [Member] Actual Asset Allocation [Member]	Dec. 31, 2011 Equity Securities, Other [Member] Actual Asset Allocation [Member]	Jun. 30, 2011 Equity Securities, Other [Member] Target Allocation [Member]	Dec. 31, 2012 Equity Securities, Other [Member]	Dec. 31, 2011 Actual Asset Allocation [Member]	Dec. 31, 2012 Actual Asset Allocation [Member]	Jun. 30, 2011 Target Allocation [Member]
Asset Allocations by Asset Categories	42.00%	42.00%	4.00%	0.00%	36.00%	67.00%	62.00%		13.00%	24.00%	26.00%		9.00%	5.00%	12.00%
Total								62.00%				26.00%				12.00%	100.00%	100.00%	100.00%