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Note Q - Stock Options - Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Outstanding (in shares) 202,996 212,461 212,461 227,274  
Outstanding, weighted average exercise price (in dollars per share) $ 16.63 $ 16.65 $ 16.65 $ 17.61  
Outstanding, weighted average remaining life (Year)     2 years 1 month 20 days 3 years 10 days 3 years 10 months 13 days
Outstanding, aggregate intrinsic value     $ 0 $ 0  
Granted (in shares)     0 0  
Granted, weighted average exercise price (in dollars per share)     $ 0 $ 0  
Exercised (in shares) 0 0 0 0 0
Exercised, weighted average exercise price (in dollars per share)     $ 0 $ 0  
Forfeited (in shares)     0 (3,291)  
Forfeited (in shares)     (0) 3,291  
Forfeited, weighted average exercise price (in dollars per share)     $ 0 $ 3.87  
Expired (in shares)     (9,465) (11,522)  
Expired, weighted average exercise price (in dollars per share)     $ 17.28 $ 39.13  
Outstanding (in shares)     202,996 212,461 227,274
Outstanding, weighted average exercise price (in dollars per share)     $ 16.63 $ 16.65 $ 17.61
Vested or expected to vest (in shares)     201,271    
Vested or expected to vest, weighted average exercise price (in dollars per share)     $ 16.72    
Vested or expected to vest, weighted average remaining life (Year)     2 years 1 month 13 days    
Vested or expected to vest, aggregate intrinsic value     $ 0    
Exercisable (in shares)     194,561    
Exercisable, weighted average exercise price (in dollars per share)     $ 17.12    
Exercisable, weighted average remaining life (Year)     2 years 10 days    
Exercisable, aggregate intrinsic value     $ 0    
The 2015 Equity Incentive Plan [Member]          
Outstanding (in shares) 90,808 90,808 90,808 94,183  
Outstanding, weighted average remaining life (Year)     10 years    
Granted (in shares)     0 0  
Exercised (in shares)     0 0  
Forfeited (in shares)     0 (3,291)  
Forfeited (in shares)     (0) 3,291  
Expired (in shares)     0 (84)  
Outstanding (in shares)     90,808 90,808 94,183
Non Plan [Member]          
Outstanding (in shares) 112,188 121,653 121,653 133,091  
Granted (in shares)     0 0  
Exercised (in shares)     0 0  
Forfeited (in shares)     0 0  
Forfeited (in shares)     (0) 0  
Expired (in shares)     (9,465) (11,438)  
Outstanding (in shares)     112,188 121,653 133,091