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Note 10 - Income Taxes (Details Textual) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2014
State and Local Jurisdiction [Member]      
Operating Loss Carryforwards $ 44.0    
Tax Credit Carryforward, Amount 2.7    
Foreign Tax Authority [Member] | Indefinite Lived [Member]      
Operating Loss Carryforwards 1.3    
Foreign Tax Authority [Member] | Ten Years [Member]      
Operating Loss Carryforwards 1.3    
Foreign Tax Authority [Member]      
Operating Loss Carryforwards 2.6    
Unrecognized Tax Benefits, Interest on Income Taxes Accrued 0.1 $ 0.1  
Effective Income Tax Rate Reconciliation, Disposition of Asset, Amount (0.9)    
Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount 0.7 0.5 $ 0.5
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount 4.9 4.0 3.8
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount     0.5
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Life Insurance, Amount     (1.1)
Valuation Allowances and Reserves, Period Increase (Decrease)     $ 0.1
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Compensation Cost, Amount 2.1 $ 2.1  
Undistributed Earnings of Foreign Subsidiaries 194.5    
Unrecognized Tax Benefits that Would Impact Effective Tax Rate $ 2.5