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Note I - Equity-based Compensation (Details Textual)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended 24 Months Ended 54 Months Ended
Sep. 30, 2016
USD ($)
$ / shares
shares
Sep. 30, 2015
USD ($)
$ / shares
shares
Sep. 30, 2016
USD ($)
shares
Sep. 30, 2015
USD ($)
Dec. 31, 2009
Dec. 31, 2008
Dec. 31, 2011
Jun. 30, 2016
Stock Appreciation Rights (SARs) [Member] | Maximum [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant as Percentage of Company Outstanding Common Stock         75.00% 50.00% 66.67% 50.00%
Stock Appreciation Rights (SARs) [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 0 0            
Restricted Stock Units (RSUs) [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares $ 9.32 $ 7.61            
Share-based Compensation Arrangement by Share-based Payment Award Fair Value Assumptions Postvest Cancellation Rate 5.04% 4.40%            
Employee Stock Purchase Plan [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 942,000   942,000          
Equity Incentive Plans [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 681,000   681,000          
Maximum [Member]                
Share-based Compensation Arrangement by Share-based Payment Award Options and Stock Appreciation Rights, Exercisable Number 1,339   1,339          
Share-based Compensation Arrangement by Share-based Payment Award Number of Expired Equity Incentive Plans               3
Share-based Compensation Arrangement by Share-based Payment Award Number of Employee Purchase Plans               1
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 12.01   12.01          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares to be Issued Upon Exercise of Outstanding Awards 2,410   2,410          
Allocated Share-based Compensation Expense | $ $ 1,461 $ 1,261 $ 3,705 $ 3,925        
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized | $ $ 5,157   $ 5,157