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Note 8 - Stock-based Compensation (Details Textual)
6 Months Ended 12 Months Ended
Jun. 14, 2016
Apr. 01, 2014
$ / shares
shares
Dec. 31, 2015
USD ($)
shares
Dec. 31, 2016
USD ($)
shares
Dec. 31, 2015
USD ($)
shares
Jun. 30, 2015
USD ($)
shares
Allocated Share-based Compensation Expense | $     $ 22,000 $ 2 $ 62 $ 96,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period       4 years    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | shares     0 0 0 33,333
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense | $     $ 0 $ 0 $ 0 $ 0
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized | $       $ 0    
Restricted Stock [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | shares [1]        
Share Price | $ / shares   $ 9.66        
Restricted Stock [Member] | Executive Vice President [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | shares   16,667        
Reverse Stock Split [Member]            
Stockholders' Equity Note, Stock Split, Conversion Ratio 6          
Plan 1998 [Member]            
Share-based Compensation, Shares Authorized under Stock Incentive Plans, Minimum Percentage of Common Stock Fair Market Value, Exercise Price       100.00%    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period       4 years    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Percentage Per Year       25.00%    
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period       10 years    
Plan 2008 [Member]            
Share-based Compensation, Shares Authorized under Stock Incentive Plans, Minimum Percentage of Common Stock Fair Market Value, Exercise Price       100.00%    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period       4 years    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Percentage Per Year       25.00%    
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period       10 years    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | shares       83,333    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value | $     $ 0 $ 12,000 $ 29,000 $ 29,000
Plan 2008 [Member] | Owners of 10% or More of Total Combined Voting Power [Member]            
Share-based Compensation, Shares Authorized under Stock Incentive Plans, Minimum Percentage of Common Stock Fair Market Value, Exercise Price       110.00%    
[1] Restricted stock was granted on April 1, 2014 to Daniel K. Jan of 16,667 shares to vest beginning on April 1, 2017. The award was part of his employment agreement and the grant price is the closing price of the stock on April 1, 2014 of $9.66. The unvested shares are forfeited upon termination of his employment.