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Note 8 - Equity-based Compensation (Details Textual)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
shares
Jun. 30, 2014
USD ($)
shares
Jun. 30, 2015
USD ($)
shares
Jun. 30, 2014
USD ($)
shares
Jun. 05, 2015
shares
Graham Holding Company [Member] | Spinoff [Member] | Restricted Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Plan Modification, Number of Employees Affected     21    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number 10,830   10,830    
Share-based Compensation Arrangement by Share-based Payment Award, Accelerated Vesting, Number     6,324    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Forfeitures     4,506    
Graham Holding Company [Member] | Restricted Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number 0 20,403 0 20,403  
Graham Holding Company [Member] | Specific Employees [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 750 22,000 750 22,000  
The 2015 Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized         600,000
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Number of Shares Authorized for Incentive Stock Options         400,000
Selling, General and Administrative Expenses [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Plan Modification, Incremental Compensation Cost | $     $ 3.7    
Allocated Share-based Compensation Expense | $ $ 4.0 $ 0.5 $ 4.3 $ 1.0