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Note 7 - Debt and Credit Agreements (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Oct. 29, 2020
Feb. 25, 2019
Oct. 26, 2016
Mar. 31, 2022
Dec. 31, 2021
Feb. 28, 2022
Nov. 08, 2021
Jun. 30, 2019
Dec. 31, 2016
Long-Term Debt, Current Maturities, Total       $ 13,855 $ 6,650        
Development Corporation of Abilene Loan [Member]                  
Long-term Debt, Total                 $ 570
Debt Instrument, Decrease, Forgiveness         114        
Notes Payable, Total       355 363        
Notes Payable, Other Payables [Member]                  
Long-term Debt, Total       272 274        
Long-Term Debt, Current Maturities, Total       $ 185 $ 186        
Debt Instrument, Interest Rate, Stated Percentage       4.00%          
Interest Rate Swap [Member]                  
Derivative Liability, Notional Amount               $ 6,000  
Derivative, Fixed Interest Rate               2.13%  
Minimum [Member] | Notes Payable, Other Payables [Member]                  
Debt Instrument, Periodic Payment, Total       $ 3          
Maximum [Member] | Notes Payable, Other Payables [Member]                  
Debt Instrument, Periodic Payment, Total       16          
Revolving Credit Facility [Member]                  
Debt Instrument, Term (Year)     3 years            
Long Term Debt Extended Term (Year)   3 years              
Line of Credit Facility, Maximum Borrowing Capacity   $ 35,000       $ 30,000      
Reserve to Revolving Loan Availability           $ 2,500 $ 5,000    
Long-Term Line of Credit, Total       13,556          
Line of Credit Facility, Remaining Borrowing Capacity       $ 13,944          
Letter of Credit [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]                  
Debt Instrument, Basis Spread on Variable Rate 2.25%                
Letter of Credit [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]                  
Debt Instrument, Basis Spread on Variable Rate 2.75%                
Letter of Credit [Member] | Base Rate [Member] | Minimum [Member]                  
Debt Instrument, Basis Spread on Variable Rate 0.00%                
Letter of Credit [Member] | Base Rate [Member] | Maximum [Member]                  
Debt Instrument, Basis Spread on Variable Rate 0.75%