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Note 13 - Stock-Based Compensation and Purchase Plans - Summary of Awards Activity Under the Executive Compensation Program (Details) - USD ($)
12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Annual Component [Member]    
Forfeited, weighted average exercise price (in dollars per share) $ 59.52  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 61.97  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 16,661  
Vested, number of shares (in shares) (11,226)  
Vested, weighted average exercise price (in dollars per share) $ 45.65  
Vested, aggregate intrinsic value $ 472,362  
Forfeited, number of shares (in shares) (325)  
Outstanding, ending balance (in shares) 35,707 30,597
Non-vested, weighted average exercise price (in dollars per share) $ 52.62  
Outstanding $ 318,334 $ 286,195
Outstanding, beginning balance (in shares) 30,597  
Non-vested, weighted average exercise price (in dollars per share) $ 59.11 $ 52.62
Performance Stock Units [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 30,326  
Vested, number of shares (in shares) (26,749)  
Vested, aggregate intrinsic value $ 1,814,874  
Forfeited, number of shares (in shares) (5,422)  
Outstanding, ending balance (in shares) 52,890 54,736
Outstanding $ 4,254,256 $ 3,926,057
Outstanding, beginning balance (in shares) 54,736