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Note 7 - Stockholders' Equity
 3 Months Ended
Sep. 30, 2017
Notes to Financial Statements  
Disclosure of Compensation Related Costs, Share-based Payments [Text Block]
7
.     
Stockholders
’
Equity
 
Stock Based Compensation
The Company
recorded stock-based compensation of
$132,000
and
$298,000
for the
three
months ended
September 30, 2017
and
2016,
respectively.
 
The following is a summary of option activity for
the Company’s stock option plans:
 
   
Number of
Shares
    
Weighted-
Average
Exercise
Price
    
Weighted-
Average
Remaining
Contractual
Life
    
Aggregate
Intrinsic
Value
  
                                 
Outstanding at June 30,
2017
    
397,389
     $
5.80
      
 
      
 
  
                                 
Granted
    
40,000
     $
3.47
      
 
      
 
  
Forfeited
    
(14,765
 )   $
3.52
      
 
      
 
  
Expired
    
(2,439
 )   $
27.04
      
 
      
 
  
                                 
Outstanding at
September 30, 2017
    
420,185
     $
5.54
      
6
     $
182,000
  
                                 
Vested and expected to v
est at September 30, 2017
    
397,590
     $
5.66
      
6
     $
175,000
  
                                 
Exercisable at
September 30, 2017
    
278,487
     $
6.64
      
5.5
     $
128,000
  
 
The aggregate intrinsic value is calculated as the difference between the exercise price of the underlying awards and the quoted price of the Company
’s common stock. There were
no
options exercised during the
three
months ended
September 30, 2017.
 
The fair value of the Company
’s stock options granted for the
three
months ended
September 30, 2017
was estimated using the following weighted-average assumptions:
 
Expected life (years)
    
4
  
Risk-free interest rate
    
1.7
 %
Expected volatility
    
108
 %
Dividend yield
    
0
 %
 
Common Stock Restricted
Units
The following is a summary of
restricted stock activity during the
three
months ended
September 30, 2017:
 
           
Weighted
Average
  
   
Number of
Shares
    
Grant Date
Fair Value
  
Balance at June 30,
2017
    
59,694
     $
4.62
  
Granted
    
10,000
     $
3.26
  
Vested
    
(60,531
 )   $
4.54
  
Forfeited
    
--
      
--
  
Outstanding at September 30, 201
7
    
9,163
     $
3.65
  
 
Warrants
There was
no
warrant activity for the
three
months ended
September 30, 2017.
At
September 30, 2017,
there were
4,828,723
warrants outstanding with a weighted-average exercise price per share of
$9.37
and
4,130,192
warrants exercisable with a weighted-average exercise price per share of
$9.60.
At
September 30, 2017,
the total intrinsic value of warrants outstanding and exercisable was
$0
.