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Note 8 - Line of Credit (Details Textual)
Apr. 28, 2023
USD ($)
Jun. 30, 2024
USD ($)
Jun. 30, 2023
USD ($)
Mar. 31, 2023
USD ($)
Jan. 09, 2021
USD ($)
Cash   $ 25,153,862 $ 23,990,879    
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) [Member]        
Minimum [Member]          
Cash $ 22,000,000        
U.S. Bank N.A. [Member] | Revolving Credit Agreement, Addendum, and Stand-Alone Revolving Note [Member]          
Line of Credit Facility, Maximum Borrowing Capacity         $ 6,000,000
Debt Instrument, Covenant, Minimum Liquid Assets   $ 12,000,000   $ 12,000,000  
Debt Instrument, Covenant, Maximum EDITDA Ratio   3   3  
Debt Instrument, Covenant, Current Ratio 6        
Debt Instrument, Basis Spread on Variable Rate 1.75%        
Long-Term Debt   $ 0      
U.S. Bank N.A. [Member] | Revolving Credit Agreement, Addendum, and Stand-Alone Revolving Note [Member] | Revolving Credit Facility [Member]          
Line of Credit Facility, Maximum Borrowing Capacity $ 10,000,000   $ 12,000,000 $ 10,000,000