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Note 10 - Commitments and Contingencies (Details Textual)
3 Months Ended 9 Months Ended
Jun. 01, 2022
USD ($)
May 24, 2022
May 09, 2022
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Sep. 09, 2022
May 12, 2022
ft²
Dec. 31, 2021
USD ($)
Loss Contingencies [Line Items]                    
Operating Lease, Right-of-Use Asset       $ 324,000   $ 324,000       $ 109,000
Operating Lease, Liability, Current       101,000   101,000       112,000
Operating Lease, Liability, Noncurrent       239,000   239,000       0
Restructuring Costs       410,000 $ 0 410,000 $ 0      
Accrued severance and benefits       392,000   392,000       0
Imputed interest       55,000   55,000        
Accrued Liabilities [Member]                    
Loss Contingencies [Line Items]                    
Accrued severance and benefits       392,000   392,000        
Restructuring Costs [Member]                    
Loss Contingencies [Line Items]                    
Restructuring Costs       410,000   410,000        
Cost Reduction Plan [Member]                    
Loss Contingencies [Line Items]                    
Reduction In Work Force               20.00%    
Insurance Financing Arrangement [Member]                    
Loss Contingencies [Line Items]                    
Line of Credit Facility, Interest Rate During Period   6.92% 3.82%              
Line of Credit Facility, Expiration Period   10 months 9 months              
Remaining balance under insurance financing arrangements       400,000   400,000       $ 100,000
Base Rate [Member]                    
Loss Contingencies [Line Items]                    
Base Rent Rate Percentage 50.00%                  
Corporate Office [Member]                    
Loss Contingencies [Line Items]                    
Area of real estate property (Square Foot) | ft²                 2,747  
Lessee, operating lease, term of contract (Month)                 39 months  
Lessee, operating lease, renewal term (Month)                 36 months  
Lease monthly payment $ 10,850                  
Operating lease, contractual monthly lease payments, yearly escalation rate 3.00%                  
Payments for (Proceeds from) Tenant Allowance $ 28,000                  
Operating Lease, Right-of-Use Asset       324,000   324,000        
Operating Lease, Liability, Current       101,000   101,000        
Operating Lease, Liability, Noncurrent       $ 239,000   $ 239,000        
Lessee, Operating Lease, Discount Rate       10.75%   10.75%        
Lessee, Operating Lease, Remaining Lease Term       2 years 10 months 24 days   2 years 10 months 24 days        
Operating Lease, Expense       $ 49,000   $ 157,000        
Imputed interest       55,000   55,000        
Total remaining future minimum lease payments       $ 395,000   $ 395,000