Note 15 - Income Taxes - Reconciliation of Income Tax Rate (Details)	3 Months Ended		6 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Reconciliation to effective tax rate:
Provision for income taxes at the anticipated annual tax rate	30.40%	33.30%	30.80%	34.50%
Enactment of tax law changes		(2.00%)		(1.00%)
Uncertain tax positions	(0.60%)	(0.30%)	(0.80%)	(0.30%)
Deferred tax asset adjustment			(1.80%)
Other	(0.50%)	(1.20%)	(0.60%)	(0.70%)
Effective tax rate	29.30%	29.80%	27.60%	32.50%