Note A - Basis of Presentation and Summary of Significant Accounting Policies - Calculation of Basic and Diluted Net Income Per Common Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
Numerator
Net income	$ 788	$ 622	$ 2,356	$ 904
Denominator
Basic weighted average common shares outstanding (in shares)	6,747,848	6,819,071	6,797,256	6,817,643
Dilutive effect of stock options (in shares)	12,000	24,000	35,000	28,000
Diluted weighted average common shares outstanding (in shares)	6,760,483	6,842,951	6,832,268	6,845,765
Basic net income per common share (in dollars per share)	$ 0.12	$ 0.09	$ 0.35	$ 0.13
Diluted net income per common share (in dollars per share)	$ 0.12	$ 0.09	$ 0.35	$ 0.13