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Note 8 - Stock-based Compensation (Details Textual) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Feb. 29, 2016
Feb. 29, 2016
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Stock Appreciation Rights (SARs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage         33.33%
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period         5 years
RSU's and Restricted Stock [Member] | Director [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 33.33%        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period         3 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   1.3      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value   $ 0.25      
RSU's and Restricted Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period         3 years
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized         2,450,000
Allocated Share-based Compensation Expense     $ 0.1 $ 0.2