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Note 7 - Stock-based Compensation - Summary of Stock Option Activity (Details) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2023
Jun. 30, 2022
Dec. 31, 2022
Dec. 31, 2021
Outstanding (in shares) 95,000 67,000 67,000  
Outstanding, grant date weighted-average exercise price (in dollars per share) $ 2.76 $ 2.72 $ 2.72  
Outstanding, weighted average remaining contractual life (Year)   3 years 3 months 14 days 4 years 9 months 29 days 3 years 3 months 29 days
Outstanding, intrinsic value   $ 3,000 $ 25,000 $ 0
Granted (in shares) 70,000      
Granted, grant date weighted-average exercise price (in dollars per share) $ 2.82      
Granted (Year) 7 years      
Forfeited (in shares) (19,000) (7,000)    
Forfeited, grant date weighted-average exercise price (in dollars per share) $ 2.69 $ 2.58    
Outstanding (in shares) 146,000 58,000 95,000 67,000
Outstanding, grant date weighted-average exercise price (in dollars per share) $ 2.80 $ 2.74 $ 2.76 $ 2.72
Exercisable (in shares) 20,000 50,000    
Exercisable, grant date weighted-average exercise price (in dollars per share) $ 2.92 $ 2.74    
Exercisable, weighted average remaining contractual life (Year)   2 years 11 months 26 days    
Exercised (in shares)   (2,000)    
Exercised, grant date weighted-average exercise price (in dollars per share)   $ 2.70    
Minimum [Member]        
Outstanding, weighted average remaining contractual life (Year) 5 years 9 months 3 days      
Exercisable, weighted average remaining contractual life (Year) 2 years 8 months 1 day      
Maximum [Member]        
Outstanding, intrinsic value $ 0