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Note 1 - Summary of Significant Accounting Policies (Details Textual)
12 Months Ended
Dec. 31, 2015
USD ($)
Dec. 31, 2016
USD ($)
shares
Dec. 31, 2015
USD ($)
shares
Dec. 20, 2015
Dec. 31, 2014
USD ($)
shares
Revenue Recognition Subscription Period   1 year      
Number of Operating Segments 6 6   7  
Number of Reportable Segments   1      
Capitalized Computer Software, Additions   $ 2,500,000 $ 2,000,000    
Asset Impairment Charges   0 0   $ 0
Impairment of Intangible Assets (Excluding Goodwill)   0 0   0
Goodwill, Impairment Loss   0 0   0
Income Tax Credits and Adjustments   77,000 156,000   $ 224,000
Cash Equivalents, at Carrying Value $ 39,800,000 $ 32,700,000 $ 39,800,000    
Percentage of Class B Common Stock Dividend or Other Distribution for Class A Common Stock Dividend or Other Distribution   0.16667%      
Common Class A [Member]          
Stock Options Excluded from Computation of Earnings Per Share, Amount | shares   156,610 487,639   162,391
Common Class A [Member] | Employee Stock Option [Member]          
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares   390,299 68,779   185,461
Common Class B [Member]          
Stock Options Excluded from Computation of Earnings Per Share, Amount | shares   49,262 58,429   19,561
Common Class B [Member] | Employee Stock Option [Member]          
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares   34,178 1,101   1,687
Furniture and Fixtures [Member] | Minimum [Member]          
Property, Plant and Equipment, Useful Life   3 years      
Furniture and Fixtures [Member] | Maximum [Member]          
Property, Plant and Equipment, Useful Life   10 years      
Computer Equipment [Member] | Minimum [Member]          
Property, Plant and Equipment, Useful Life   3 years      
Computer Equipment [Member] | Maximum [Member]          
Property, Plant and Equipment, Useful Life   5 years      
Software and Software Development Costs [Member] | Minimum [Member]          
Property, Plant and Equipment, Useful Life   1 year      
Software and Software Development Costs [Member] | Maximum [Member]          
Property, Plant and Equipment, Useful Life   5 years      
Building and Building Improvements [Member] | Minimum [Member]          
Property, Plant and Equipment, Useful Life   7 years      
Building and Building Improvements [Member] | Maximum [Member]          
Property, Plant and Equipment, Useful Life   40 years      
Sales Revenue, Net [Member] | Customer Concentration Risk [Member]          
Concentration Risk, Percentage   17.00% 15.00%   16.00%