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Note 4 - Borrowings (Details Textual) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Jan. 22, 2021
Apr. 23, 2020
Feb. 14, 2018
Apr. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Aug. 10, 2022
Dec. 31, 2021
Apr. 17, 2021
Jun. 15, 2016
Sep. 22, 2015
Gain (Loss) on Extinguishment of Debt, Total             $ (0) $ 2,353,000          
Interest Expense, Total         $ 440,000 $ 399,000 879,000 795,000          
Paycheck Protection Program CARES Act [Member]                          
Proceeds from Issuance of Long-term Debt, Total   $ 2,300,000                      
Long-term Debt, Total                     $ 0    
Debt Instrument Interest Forgiven       $ 23,000                  
Interest Expense, Total           1,000   7,000          
Paycheck Protection Program CARES Act [Member] | Other Nonoperating Income (Expense) [Member]                          
Gain (Loss) on Extinguishment of Debt, Total       $ 2,400,000                  
CRG [Member] | Loan Agreement [Member]                          
Debt Agreement, Maximum Borrowing Capacity                         $ 50,000,000
Debt Instrument, Covenant Compliance, Minimum Liquidity Requirement     $ 3,500,000                    
Debt Instrument, Covenant Compliance, Target Minimum Revenue, Past Twelve Months                   $ 8,000,000      
Debt Instrument, Covenant Compliance Target Minimum Revenue, Next Twelve Months $ 10               $ 8,000,000        
Debt Instrument, Covenant, Compliance Target Minimum Revenue Second Year 12,000,000               $ 10,000,000        
Debt Instrument, Covenant Compliance Target Minimum Revenue Third Year 14,500,000                        
Debt Instrument, Covenant Compliance Target Minimum Revenue Fourth Year $ 17,000,000                        
Debt Instrument, Interest Rate, Stated Percentage 12.50%                        
Debt Instrument, Periodic Payment, Total $ 1,900,000                        
Long-Term Debt, Maturity, Year Four 7,500,000                        
Long-Term Debt, Maturity, Year Five $ 7,500,000                        
Debt Instrument, Redemption Initial Prepayment Premium Percentage 5.00%                        
Debt Instrument, Redemption Annual Decline in Prepayment Premium Percentage 1.00%                        
Debt Instrument, Redemption Prepayment Premium Percentage after Fifth Year 0.00%                        
Debt Instrument, Financing Fee Percentage 1.50%                        
Debt Instrument, Final Facility Fee Percentage 15.00%                        
Debt Instrument, Covenant Compliance Cash and Certain Cash Equivalents Minimum $ 3,500,000                        
Debt Instrument, Covenant Compliance Prepayment Multiplier for Revenue Shortfall 2.0                        
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net, Total           291,000   291,000   $ 333,000     1,300,000
Amortization of Debt Discount (Premium)         21,000 16,000 42,000 44,000          
Interest Expense, Debt, Total         $ 440,000 $ 397,000 $ 900,000 $ 790,000          
CRG [Member] | Loan Agreement [Member] | Series A Preferred Stock Purchase Agreement with CRG [Member]                          
Debt Conversion, Original Debt, Amount     38,000,000                    
Debt Conversion, Fees and Prepayment Premium Amount     $ 3,800,000                    
CRG [Member] | Loan Agreement [Member] | First Tranche, Borrowed on September 22, 2015 [Member]                          
Debt Instrument, Face Amount                         $ 30,000,000
CRG [Member] | Loan Agreement [Member] | Second Tranche, Borrowed on June 15, 2016 [Member]                          
Debt Instrument, Face Amount                       $ 10,000,000