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Note I - Stockholders' Equity (Details Textual) - USD ($)
 1 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 17, 2019
May 14, 2019
Jun. 30, 2020
Apr. 30, 2020
Mar. 31, 2019
Feb. 28, 2019
May 31, 2014
Dec. 31, 2020
Dec. 31, 2019
Dec. 17, 2019
Dec. 31, 2018
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)                 $ 1.97 $ 0.50   $ 2.55
Proceeds from Stock Options Exercised                 $ 384,146    
Proceeds from Issuance of Private Placement             $ 250,000 $ 10,000,000 $ 250,000    
Share Price (in dollars per share)                   $ 0.84    
Proceeds from Issuance of Common Stock                 $ 18,043,284 $ 1,974,547    
Deferred Compensation Arrangement with Individual, Shares Authorized for Issuance (in shares)                 2,428,329 2,375,760   2,470,566
Share-based Compensation Arrangement by Share-based Payment Award, Options, Reclassified in Period (in shares)                   600,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Reclassified in Period, Amount                   $ 422,000    
Reclassification of Shares to be Issued, Amount                   $ 1,300,000    
Class of Warrant or Right, Exercised During Period (in shares)                 1,163,775 675,000    
Stock Issued During Period, Shares, Shares to be Issued (in shares)                   1,300,000    
Gain (Loss) from Warrants Exercised                   $ (500,000)    
Gain (Loss) on Issuance of Shares to be Issued                   (500,000)    
Adjustments to Additional Paid in Capital, Warrants Exercised                   650,000    
Adjustments to Additional Paid in Capital, Shares to be Issued                   $ 1,070,000    
Common Stock, Shares Authorized (in shares)   75,000,000             85,000,000 85,000,000 75,000,000  
Shares To Be Issued, Marked To Market, Shares (in shares)   2,100,000                    
Market to Market, Gain (Loss)   $ (500,000)               $ (2,600,000)    
Adjustments to Additional Paid in Capital, Reclassification of Derivative Liability to Option                   380,000    
Adjustments to Additional Paid in Capital, Reclassification of Derivative Liability to Equity   2,640,000               $ 4,115,778 $ 2,700,000  
Adjustments to Additional Paid in Capital, Warrants Exercised and Shares to be Issued   4,100,000                    
Stock Issued During Period Shares, Warrants Exercised (in shares)                   675,000    
Reclassification to Additional Paid in Capital   $ 1,070,000               $ 655,000    
Derivative, Gain (Loss) on Derivative, Net, Total                   $ 500,000    
Common Stock, Shares, To be Issued (in shares)   2,100,000                 2,100,000  
Gain (Loss) on Liability Classified Shares to Be Issued   $ (1,800,000)                    
Share-based Payment Arrangement, Option [Member]                        
Share Price (in dollars per share)                   $ 1.28    
Share based Compensation Arrangement By Share based Payment Award, Options Reclassified In Period, Marked To Market   600,000                    
Market to Market, Gain (Loss)   $ 40,000               $ 40,000    
Shares To Be Issued [Member]                        
Reclassification of Shares to be Issued, Amount                   1,405,000    
Market to Market, Gain (Loss)                   $ (1,800,000)    
Chief Executive Officer, Chief Financial Officer and Employees [Member]                        
Deferred Compensation Arrangement with Individual, Shares Authorized for Issuance (in shares)                 2,256,844 2,226,473    
Non-Employees [Member]                        
Common Stock, Capital Shares Reserved for Future Issuance (in shares)                 171,485 149,287    
Preferred Stock Converted to Common Stock [Member]                        
Conversion of Stock, Conversion Price (in dollars per share)     $ 1.17                  
Conversion of Stock, Shares Issued (in shares)     5,982,906                  
Warrants, Public Offering [Member]                        
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)             1,428,750          
Warrants and Rights Outstanding, Term (Year)             5 years          
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)             $ 0.50          
Underwrite Warrants [Member]                        
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)           141,850 141,850          
Warrants, Private Offering [Member]                        
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)             178,571          
Warrants and Rights Outstanding, Term (Year)             5 years          
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)             $ 0.50          
Warrants Associated With April 2020 Public Offering [Member]                        
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)         2,710,000              
Warrants and Rights Outstanding, Term (Year)         3 years              
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)         $ 1.20              
Warrants Associated With the June 2020 Public Offering [Member]                        
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) 3,749,000     3,749,000                
Warrants and Rights Outstanding, Term (Year) 3 years     3 years                
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) $ 2.60     $ 2.60                
Warrants Issued in 2016 Capital Raise [Member]                        
Class of Warrant or Right, Reclassified During Period (in shares)                   1,600,000    
Reclassification of Shares to be Issued, Shares (in shares)                   3,400,000    
Class of Warrant or Right, Value, Reclassified During Period                   $ 0    
Class of Warrant or Right, Marked to Market (in shares)   1,600,000                    
Market to Market, Gain (Loss)   $ 0               $ 0    
Adjustments to Additional Paid in Capital, Reclassification of Derivative Liability to Warrants   $ 1,095,000                    
Warrants Issued in 2019 Capital Raise [Member]                        
Class of Warrant or Right, Reclassified During Period (in shares)                   1,700,000    
Class of Warrant or Right, Value, Reclassified During Period                   $ 376,000    
Class of Warrant or Right, Marked to Market (in shares)   1,100,000                    
Market to Market, Gain (Loss)   $ (860,000)               $ (860,000)    
Adjustments to Additional Paid in Capital, Reclassification of Derivative Liability to Warrants   0                    
Adjustments to Additional Paid in Capital, Reclassification of Derivative Liability to Option   $ 380,000                    
Warrants Previously Classified as Derivative Liability [Member]                        
Class of Warrant or Right, Exercised During Period (in shares)                   665,000    
The 2019 Warrants [Member]                        
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)                 1,749,171 1,084,171    
Adjustments to Additional Paid in Capital, Reclassification of Derivative Liability to Warrants                   $ 1,095,000    
The 2016 Warrants [Member]                        
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)                 1,592,775 1,592,775    
Adjustments to Additional Paid in Capital, Reclassification of Derivative Liability to Warrants                   $ 0    
Public Offering [Member]                        
Proceeds from Issuance or Sale of Equity, Total             $ 2,000,000          
Stock Issued During Period, Shares, New Issues (in shares)             5,715,000          
Proceeds from Stock Options Exercised           $ 198,000 $ 198,000          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares)           567,400 567,400          
Private Placement [Member]                        
Stock Issued During Period, Shares, New Issues (in shares)             714,286 2,000,000        
Proceeds from Issuance of Common Stock               $ 3,000,000        
Shares Issued, Price Per Share (in dollars per share)               $ 1.50        
Proceeds from Issuance of Convertible Preferred Stock               $ 7,000,000        
Private Placement [Member] | Series A Convertible Preferred Stock [Member]                        
Stock Issued During Period, Shares, New Issues (in shares)               7,000        
Shares Issued, Price Per Share (in dollars per share)               $ 1,000        
Preferred Stock, Redemption Price Per Share (in dollars per share)               2.545        
Private Placement [Member] | Series A Convertible Preferred Stock [Member] | Conversion Price if Common Stock Not Trade at 3.15 [Member]                        
Preferred Stock, Redemption Price Per Share (in dollars per share)               $ 1.50        
April 6, 2020 Public Offering [Member]                        
Stock Issued During Period, Shares, New Issues (in shares)         5,420,000              
Proceeds from Issuance of Common Stock, Gross         $ 5,100,000              
Share Price (in dollars per share)         $ 0.95              
Proceeds from Issuance of Common Stock         $ 4,600,000              
June 30, 2020 Public Offering [Member]                        
Stock Issued During Period, Shares, New Issues (in shares) 6,770,000                      
Proceeds from Issuance of Common Stock, Gross $ 14,600,000                      
Share Price (in dollars per share) $ 2.15     $ 2.15                
Proceeds from Issuance of Common Stock       $ 13,400,000