Note 14 - Capital Structure and Stock-based Compensation - Stock Option Activity (Details) - $ / shares	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Options outstanding at beginning of period (in shares)	10,000	10,000	10,000
Options outstanding at beginning of period (in dollars per share)	$ 16	$ 16	$ 16
Exercised (in shares)	4,000	0
Exercised (in dollars per share)	$ 16	$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	0	0	0
Granted (in dollars per share)	$ 0	$ 0	$ 0
Options outstanding at end of period (in shares)	6,000	10,000	10,000
Options outstanding at end of period (in dollars per share)	$ 16	$ 16	$ 16
Options exercisable at end of period (in shares)	4,000	6,000	4,000
Shares available for issuance (in shares)	2,322,643	2,219,845	2,115,246