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Note 3 - Stock-based Compensation Plans and Warrants (Details Textual) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended 54 Months Ended
Jun. 10, 2014
Dec. 18, 2009
May 31, 2017
Jun. 30, 2014
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Jun. 30, 2017
Jun. 09, 2014
Allocated Share-based Compensation Expense, Total         $ 105,000 $ 1,816,000      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance         507,500        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period         0        
Warrants [Member] | Interest Expense [Member]                  
Unrealized Gain (Loss) on Derivatives         $ 516,000        
2017 Warrants [Member]                  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights     362,500            
Warrants and Rights Outstanding     $ 2,900,000            
Warrant Term     5 years            
Class of Warrant or Right, Exercise Price of Warrants or Rights     $ 14.94            
Employee Stock Option [Member]                  
Allocated Share-based Compensation Expense, Total         $ 0 $ 0      
Two Thousand Nine Equity Incentive Plan [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 850,000 850,000              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period       45,235          
Two Thousand Nine Equity Incentive Plan [Member] | Common Stock [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period                 297,265
Two Thousand Nine Equity Incentive Plan [Member] | Employee Stock Option [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period   10 years              
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period                 507,500
Two Thousand Nine Equity Incentive Plan [Member] | Employee Stock Option [Member] | Maximum [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   2 years              
Twenty Fourteen Equity Incentive Plan [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 675,000                
Twenty Fourteen Equity Incentive Plan [Member] | Outside Director [Member] | Accrues Yearly [Member]                  
Salary and Wage, Officer, Excluding Cost of Good and Service Sold $ 30,000                
Allocated Share-based Compensation Expense, Total 20,000                
Twenty Fourteen Equity Incentive Plan [Member] | Outside Director [Member] | Accrues Quarterly [Member]                  
Salary and Wage, Officer, Excluding Cost of Good and Service Sold 7,500                
Allocated Share-based Compensation Expense, Total $ 5,000                
Two Thousand Fourteen Equity Incentive Plan [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period             675,000    
Two Thousand Fourteen Equity Incentive Plan [Member] | Directors, Consultants and Employees [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period         611,226        
Two Thousand Fourteen Equity Incentive Plan [Member] | Director [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period               8,694