Note I - Treasury Stock	6 Months Ended
Dec. 31, 2017
Notes to Financial Statements
Treasury Stock [Text Block]	I. Treasury Stock On June 2, 2011, the Board of Directors authorized the repurchase of up to $2.0 million of our common stock. On February 6, 2015, the Board of Directors authorized a $1.0 million increase to our stock repurchase plan bringing the total authorized repurchase amount to $3.0 million. On May 11, 2015, the Board of Directors authorized a $2.0 million increase to our stock repurchase plan bringing the total authorized repurchase amount to $5.0 million. On March 28, 2017, the Board of Directors authorized a $2.0 million increase to our stock repurchase plan bringing the total authorized repurchase amount to $7.0 million. Under the repurchase plan, we may, from time to time, purchase shares of our common stock, depending upon market conditions. When we do so we may purchase the shares in open market or privately negotiated transactions. During the three and six months ended December 31, 2017 and December 31, 2016, we did not repurchase any shares under this repurchase plan. During the three months ended December 31, 2017, we acquired 7,264 shares in connection with restricted stock shares that vested during that year at a weighted average cost of $10.80 per share and a total cost of $78,000. During the six months ended December 31, 2017, we acquired 7,998 shares in connection with restricted stock shares that vested during that period at a weighted average cost of $10.79 per share and a total cost of $86,000. During the three months ended December 31, 2016, we acquired 367 shares from employees in connection with restricted stock shares that vested during the period at a weighted average cost of $12.30 per share and a total cost of $5,000. During the six months ended December 31, 2016, we acquired 6,404 shares from employees in connection with restricted stock shares that vested during the period at a weighted average cost of $13.09 per share and a total cost of $84,000. These shares were returned to NAI by the related employees and in return NAI paid each employee’s required tax withholding required as a result of the vesting of the restricted shares. The valuation of the shares acquired and thereby the number of shares returned to NAI was calculated based on the closing share price on the date the restricted shares vested.

I. Treasury Stock

June

2011,

the Board of Directors authorized the repurchase of up to

$2.0

million of our common stock. On

February 6, 2015,

the Board of Directors authorized a

$1.0

million increase to our stock repurchase plan bringing the total authorized repurchase amount to

$3.0

million. On

May 11, 2015,

the Board of Directors authorized a

$2.0

million increase to our stock repurchase plan bringing the total authorized repurchase amount to

$5.0

million. On

March 28, 2017,

the Board of Directors authorized a

$2.0

million increase to our stock repurchase plan bringing the total authorized repurchase amount to

$7.0

million. Under the repurchase plan, we

may,

from time to time, purchase shares of our common stock, depending upon market conditions. When we do so we

may

purchase the shares in open market or privately negotiated transactions.

During the

three

and

six

months ended

December 31, 2017

and

December 31, 2016,

we did

not

repurchase any shares under this repurchase plan.

During

the

three

months ended

December 31, 2017,

we acquired

7,264

shares in connection with restricted stock shares that vested during that year at a weighted average cost of

$10.80

per share and a total cost of

$78,000.

During the

six

months ended

December 31, 2017,

we acquired

7,998

shares in connection with restricted stock shares that vested during that period at a weighted average cost of

$10.79

per share and a total cost of

$86,000.

During the

three

months ended

December 31, 2016,

we acquired

367

shares from employees in connection with restricted stock shares that vested during the period at a weighted average cost of

$12.30

per share and a total cost of

$5,000.

During the

six

months ended

December 31, 2016,

we acquired

6,404

shares from employees in connection with restricted stock shares that vested during the period at a weighted average cost of

$13.09

per share and a total cost of

$84,000.

These shares were returned to NAI by the related employees and in return NAI paid each

employee’s required tax withholding required as a result of the vesting of the restricted shares. The valuation of the shares acquired and thereby the number of shares returned to NAI was calculated based on the closing share price on the date the restricted shares vested.