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Note A - The Company and Summary of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
   
December 31,
 
   
201
7
   
201
6
 
                 
Accounts receivable - current
  $
2,889,731
    $
1,577,031
 
Accounts receivable
- non current
   
1,760,000
     
2,070,000
 
     
4,649,731
     
3,647,031
 
Allowance for doubtful accounts - current
   
(13,785
)
   
(13,785
)
Allowance for doubtful accounts
- non current
   
(1,000,000
)
   
(500,000
)
     
(1,013,785
)
   
(513,785
)
                 
Accounts receivable, net of allowances for doubtful accounts
  $
3,635,946
    $
3,133,246
 
Summary of Valuation Allowance [Table Text Block]
   
Balance at
Beginning
of Year
   
Charged to
Costs
and
Expenses
   
Deductions
From
Reserves
   
Balance at
End of Year
 
Year Ended December 31, 201
7
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Allowance for Doubtful Accounts
  $
513,785
    $
500,000
    $
-
    $
1,013,785
 
Year Ended December 31, 201
6
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Allowance for Doubtful Accounts
  $
13,785
    $
500,000
    $
-
    $
513,785
 
Useful Lives of Property Plan and Equipment [Table Text Block]
   
Years
 
Equipment and leasehold improvements
 
 
 
 
 
Equipment (years)
 
3
-
5
 
Furniture and fixtures (years)
 
3
-
5
 
Software (years)
 
 
3
 
 
Leasehold improvements
 
life or lease term
 
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]
   
Year ended
December 31,
 
   
2017
   
2016
 
                 
Selling, general and administrative
  $
864,036
    $
353,056
 
Research, development and engineering
   
108,728
     
74,786
 
    $
972,764
    $
427,842
 
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
   
Year ended
December 31,
 
   
2017
   
2016
 
Weighted average Risk free interest rate
   
1.92
%
   
1.11
%
Expected life of options (in years)
   
4.51
     
4.50
 
Expected dividends
   
0
%
   
0
%
Weighted average Volatility of stock price
   
138
%
   
93
%