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Note 6 - Share-based Compensation and Employee Benefit Plan (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Restricted Stock [Member] | Share-based Compensation Award, Tranche Two [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     4 years    
Restricted Stock [Member] | Share-based Compensation Award, Tranche One [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     3 years    
Restricted Stock [Member] | Share-based Compensation Award, Tranche Three [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     5 years    
Restricted Stock [Member] | Resignation of Chief Executive Officer and Chief Operating Officer [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period 65,000        
Allocated Share-based Compensation Expense, Reversal $ 227,000        
Allocated Share-based Compensation Expense $ 182,000        
Restricted Stock [Member] | Director [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     5,884    
Restricted Stock [Member] | Employee [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     52,200    
Restricted Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period 65,500 1,539 69,713 1,539  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 9,760 58,084 12,700  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options $ 505,000   $ 505,000    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition     3 years 51 days    
Employee Stock Option and Restricted Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 3,000,000   3,000,000    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 2,884,716   2,884,716    
Phantom Share Units (PSUs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 1,000,000   1,000,000    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 1,000,000   1,000,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 0   0   0
Allocated Share-based Compensation Expense   $ 112,000 $ 126,000 $ 340,000  
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay     50.00%    
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent     6.00%    
Defined Contribution Plan, Cost Recognized $ 39,000 $ 35,000 $ 120,000 $ 112,000