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Note F - Debt (Details Textual)
9 Months Ended
Aug. 20, 2021
USD ($)
Aug. 18, 2021
USD ($)
Mar. 31, 2022
USD ($)
Mar. 31, 2021
USD ($)
Dec. 31, 2021
USD ($)
Jun. 30, 2021
USD ($)
May 24, 2021
USD ($)
Jan. 31, 2021
USD ($)
Payments to Acquire Property, Plant, and Equipment, Total     $ 21,468,000 $ 4,251,000        
Interest Rate Swap [Member]                
Derivative, Fixed Interest Rate   2.40%            
Manufacturing Facility and Warehouse [Member] | Carlsbad, California [Member]                
Payments to Acquire Property, Plant, and Equipment, Total $ 17,500,000              
Wells Fargo Bank, N.A. [Member]                
Debt Instrument, Covenant, Annual Limit To Repurchase Stock or Issue Dividends         $ 5,000,000.0     $ 7,000,000.0
Wells Fargo Bank, N.A. [Member] | Credit Agreement [Member]                
Line of Credit Facility, Maximum Borrowing Capacity             $ 20,000,000.0  
Debt Instrument Covenant Capital Expenditures Limitation, Amount, Next Twelve Years   $ 15,000,000.0       $ 10,000,000.0    
Debt Instrument Covenant Minimum, Net Income Required   $ 1.00            
Debt Instrument Covenant, Fixed Charge Coverage Ratio   1.25            
Debt Instrument Covenant Capital Expenditures Limitation, Amount, After Twelve Years           $ 7,500,000    
Long-term Debt, Percentage Bearing Fluctuating Interest, Threshold Amount   $ 100,000            
Minimum Prepayment Amount Under Line of Credit   $ 100,000            
Line of Credit Facility, Commitment Fee Percentage   0.125%            
Line of Credit Facility, Remaining Borrowing Capacity     20,000,000.0          
Wells Fargo Bank, N.A. [Member] | Credit Agreement [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]                
Debt Instrument, Basis Spread on Variable Rate   1.29%            
Debt Instrument Basis Spread on Elected Fixed Rate Borrowing   1.29%            
Wells Fargo Bank, N.A. [Member] | Credit Agreement [Member] | Maximum [Member]                
Ratio of Indebtedness to Net Capital   1.50            
Ratio of Total Current Assets to Total Current Liabilities   1.75            
Wells Fargo Bank, N.A. [Member] | Credit Agreement [Member] | Term Loan [Member]                
Debt Instrument, Face Amount   $ 10,000,000.0            
Debt Instrument, Term (Year)   7 years            
Debt Instrument, Amortization Period (Year)   25 years            
Long-Term Debt, Total     $ 9,800,000          
Wells Fargo Bank, N.A. [Member] | Credit Agreement [Member] | Term Loan [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]                
Debt Instrument, Basis Spread on Variable Rate   1.80%