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Note 7 - Commitments and Contingencies (Details Textual) - USD ($)
12 Months Ended 21 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2021
Apr. 01, 2020
Commitments and Contingencies [Line Items]        
Weighted average remaining lease term 22 years 6 months      
Weighted average discount rate 5.80%      
Rent expense relating to operating leases, including straight-line rent $ 500,000 $ 500,000    
Annual percentage of changes in rent 4.00%      
Deferred rent outstanding $ 2,343,000 $ 1,398,000 $ 1,398,000  
Outstanding commitments $ 0      
Minimum [Member]        
Commitments and Contingencies [Line Items]        
Office leases initial terms 3 years      
Maximum [Member]        
Commitments and Contingencies [Line Items]        
Office leases initial terms 51 years      
COVID-19 [Member]        
Commitments and Contingencies [Line Items]        
Deferred contractual revenue       $ 600,000
Deferred contractual revenue waived     $ 300,000  
COVID-19 [Member] | Maximum [Member]        
Commitments and Contingencies [Line Items]        
Deferred rent outstanding $ 100,000