Note 7 - Stock Based Compensation (Detail) (USD $)	1 Months Ended	12 Months Ended							60 Months Ended		12 Months Ended
	Dec. 31, 2003	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2016	Dec. 31, 2011	Jun. 30, 2011 Time-Based Shares [Member]	Jun. 30, 2010 Time-Based Shares [Member]	Jun. 30, 2007 Time-Based Shares [Member]	Jun. 30, 2012 Director Shares [Member]	Jun. 30, 2011 Director Shares [Member]	Jun. 30, 2010 Director Shares [Member]	Jun. 30, 2007 Director Shares [Member]	Jun. 30, 2011 2008 Enhanced Performance Shares [Member]	Jun. 30, 2010 2008 Enhanced Performance Shares [Member]	Jun. 30, 2008 2008 Enhanced Performance Shares [Member]	Jun. 30, 2012 2010 Enhanced Performance Shares [Member] Granted on July 1, 2012 [Member]	Jun. 30, 2012 2010 Enhanced Performance Shares [Member]	Jun. 30, 2011 2010 Enhanced Performance Shares [Member]	Jun. 30, 2010 2010 Enhanced Performance Shares [Member]	Jun. 30, 2012 Market Condition Shares [Member] Granted on July 1, 2012 [Member]	Jun. 30, 2012 Market Condition Shares [Member]	Jun. 30, 2011 Market Condition Shares [Member]	Jun. 30, 2010 Market Condition Shares [Member]	Jun. 30, 2012 Stock Options [Member]	Jun. 30, 2011 Stock Options [Member]	Jun. 30, 2010 Stock Options [Member]
Allocated Share-based Compensation Expense		$ 9,000	$ 32,000	$ 122,000	$ 275,000	$ 1,129,000	$ 1,328,000	$ 715,000	$ 438,000		$ 3,000	$ 10,000		$ 70,000	$ 70,000	$ 70,000		$ 60,000	$ 381,000			$ 627,000	$ 521,000	$ 19,000	$ 83,000	$ 81,000	$ 83,000	$ 6,000	$ 351,000	$ 591,000	$ 229,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares)	2,000,000									2,000,000														168,750		56,250
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in Shares)						1,935,671
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Number of Shares To Be Issued (in Shares)	1,700,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized (in Shares)	300,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in Shares)													35,000	5,495	6,426	9,513				220,000	37,500	56,000	56,000	19,000	12,500	18,750	18,750	6,250
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period													3 years
Restricted Stock Award, Forfeitures												9,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in Dollars per share)														$ 12.73			$ 10,000					$ 12.06				$ 4.69
Allocated Share-based Compensation Expense, Future Periods																					547,000	637,000				96,000
Proceeds from Stock Options Exercised						579,000	525,000	928,000
Stock Issued During Period, Shares, Issued for Noncash Consideration (in Shares)						17,000
Excess Tax Benefit (Tax Deficiency) from Share-based Compensation, Financing Activities						333,000	122,000	167,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value						612,000	182,000	411,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in Dollars per share)						$ 4.34	$ 4.12	$ 2.95
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value																													$ 973,000	$ 494,000	$ 136,000