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Note F - Long-term Debt (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Dec. 21, 2021
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2021
Dec. 31, 2022
Letters of Credit Outstanding, Amount   $ 800   $ 800     $ 800
Proceeds from Lines of Credit, Total       0      
Interest Expense, Debt   $ 29 $ 97 $ 167 $ 196    
Texas Capital Bank [Member]              
Debt Instrument, Interest Rate, Effective Percentage   6.81%   6.81%      
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage       0.25%      
Revolving Credit Facility [Member] | Texas Capital Bank [Member] | Bloomberg Short-Term Bank Yield Index Rate [Member]              
Debt Instrument, Basis Spread on Variable Rate 2.25%            
New Credit Facility [Member]              
Long-Term Line of Credit   $ 0   $ 0     $ 0
New Credit Facility [Member] | Revolving Credit Facility [Member]              
Line of Credit Facility, Maximum Borrowing Capacity   $ 24,200   $ 24,200      
New Credit Facility [Member] | Revolving Credit Facility [Member] | Texas Capital Bank [Member]              
Line of Credit Facility, Maximum Borrowing Capacity $ 25,000            
Debt Instrument, Term (Year) 3 years            
Texas Capital Credit Facility [Member]              
Long-Term Line of Credit           $ 5,000  
Repayments of Long-term Lines of Credit           $ 12,100