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Note 10 - Equity, Share-based Compensation, Warrants and Securities Offerings (Details Textual) - USD ($)
1 Months Ended 3 Months Ended 10 Months Ended 12 Months Ended
Sep. 13, 2021
Oct. 31, 2022
Mar. 16, 2023
Sep. 30, 2021
Oct. 31, 2022
Dec. 31, 2022
Dec. 31, 2021
Sep. 30, 2022
Jul. 14, 2022
Dec. 31, 2020
Common Stock, Capital Shares Reserved for Future Issuance (in shares)           1,088,457        
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number, Ending Balance (in shares)           2,298,769 875,067     664,592
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)           55,424 64,396      
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures and Expirations in Period, Total (in shares)           8,972 3,107      
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price (in dollars per share)           $ 19.42        
Share-based Compensation Arrangement By Share-based Payment Award Options Forfeitures and Expirations, Weighted Average Remaining Contractual Term (Year)           5 years 10 months 24 days        
Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount           $ 70,000        
Share-Based Payment Arrangement, Option [Member]                    
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)           1 year 1 month 6 days        
Restricted Stock Units (RSUs) [Member]                    
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Nonvested           $ 0.3        
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested           0.2        
Restricted Stock Units (RSUs) [Member] | Subsequent Event [Member]                    
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures, Total (in shares)     68,693              
Stock Units Issued (SUI) [Member]                    
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Nonvested           0.1        
RSUs and SUs [Member]                    
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding           600,000        
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total           $ 1,200,000        
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)           2 years 9 months 18 days        
Unvested RSU [Member]                    
Common Stock, Capital Shares Reserved for Future Issuance (in shares)           165,790        
Vested RSU [Member]                    
Common Stock, Capital Shares Reserved for Future Issuance (in shares)           224,725        
Stock Units [Member]                    
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total           $ 0.2        
Stock Issued During Period, Shares, Restricted Stock Award, Gross (in shares)           160,000        
Stock Issued During Period, Shares, Restricted Stock Award, Cash Signing Fee           $ 0.2        
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)           2 years 8 months 12 days        
Options, RSUs and SUs [Member]                    
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total           $ 1,300,000        
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)           2 years 8 months 12 days        
Warrant A [Member]                    
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)             $ 10.00 $ 2.72    
Stock Issued During Period, Cashless Exercise Of Warrants Shares (in shares)             230,750      
The 2014 Equity Incentive Plan [Member]                    
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)           1,230,000     600,000  
Common Stock, Capital Shares Reserved for Future Issuance (in shares)           141,543        
The 2014 Equity Incentive Plan [Member] | Share-Based Payment Arrangement, Option [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)             10 years      
The 2014 Equity Incentive Plan [Member] | Restricted Stock Units (RSUs) [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number, Ending Balance (in shares)             1,000,000      
The Prefunded Warrants [Member]                    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) 230,786 325,000     325,000          
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) $ 0.001 $ 0.0001     $ 0.0001          
Class of Warrant or Right, Exercise Price, Prefunded (in dollars per share) $ 6.499 $ 1.4999     $ 1.4999          
Warrants Issued in Private Placement [Member]                    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)   63,000     63,000          
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)   $ 1.875     $ 1.875 $ 1.60        
Proceeds from Issuance or Sale of Equity, Total   $ 1,000,000.0                
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs         $ 500,000          
Offering Cost Liability Outstanding           $ 300,000        
Warrants Issued in Private Placement [Member] | Maximum [Member]                    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)   2,000,000     2,000,000          
The Warrant [Member]                    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) 230,769                  
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) $ 10.00                  
Class of Warrant or Right, Change in Exercise Price, Maximum Percentage of Five-day Volume Weighted Average Common Stock 110.00%                  
Warrants and Rights Outstanding $ 600,000                  
Warrant A [Member]                    
Class of Warrant or Right, Change in Exercise Price, Maximum Percentage of Five-day Volume Weighted Average Common Stock             110.00%      
Offering Pursuant to Shelf Registration Statement [Member]                    
Stock Issued During Period, Shares, New Issues (in shares) 230,750 675,000                
Proceeds from Issuance or Sale of Equity, Total $ 2,800,000                  
Payments of Stock Issuance Costs $ 200,000                  
At-the-market Offering Program [Member]                    
Stock Issued During Period, Shares, New Issues (in shares)       75,490            
Payments of Stock Issuance Costs       $ 100,000            
Shares Issued, Price Per Share (in dollars per share)       $ 8.00            
Proceeds from Issuance of Common Stock       $ 500,000            
Series A Through F Preferred Stock [Member]                    
Preferred Stock, Shares Outstanding, Ending Balance (in shares)           0        
Series G Preferred Stock [Member]                    
Preferred Stock, Shares Outstanding, Ending Balance (in shares)           150 150      
Convertible Preferred Stock, Shares Issued upon Conversion (in shares)           94.89915        
Preferred Stock, Liquidation Preference Per Share (in dollars per share)           $ 1,000