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Note 8 - Line of Credit (Details Textual) - USD ($)
Jun. 30, 2022
Oct. 06, 2021
Jun. 30, 2021
Long-Term Line of Credit, Total $ 2,590,907   $ 6,000,000
U.S. Bank N.A. [Member] | Revolving Credit Agreement, Addendum, and Stand-Alone Revolving Note [Member]      
Line of Credit Facility, Maximum Borrowing Capacity   $ 6,000,000.0  
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   $ 10,000,000.0