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Note 5 - Debt (Details Textual) - USD ($)
1 Months Ended 7 Months Ended 12 Months Ended
Apr. 30, 2022
May 31, 2022
May 31, 2021
May 28, 2021
May 31, 2020
Mar. 31, 2020
Mar. 31, 2017
Jul. 31, 2022
Dec. 31, 2022
Dec. 31, 2021
Repayments of Long-Term Debt, Total                 $ 8,455,342 $ 4,010,231
Debt and Lease Obligation, Total                 15,000,000 18,455,342
Minimum [Member]                    
Adjusted Capital                 59,700,000  
Revolving Credit Facility [Member] | Quad City Bank & Trust [Member]                    
Debt Instrument, Collateral Amount                 4,000,000.0  
Long-Term Line of Credit, Total                 0  
Debt Covenant Adjusted Capital                 21,000,000.0  
Revolving Credit Facility [Member] | Quad City Bank & Trust [Member] | Prime Rate [Member]                    
Debt Instrument, Basis Spread on Variable Rate               0.50%    
Revolving Credit Facility [Member] | Quad City Bank & Trust [Member] | Minimum [Member]                    
Line of Credit Facility, Maximum Borrowing Capacity               $ 2,000,000.0    
Revolving Credit Facility [Member] | Quad City Bank & Trust [Member] | Minimum [Member] | Prime Rate [Member]                    
Debt Instrument, Basis Spread on Variable Rate               4.75%    
Revolving Credit Facility [Member] | Quad City Bank & Trust [Member] | Maximum [Member]                    
Line of Credit Facility, Maximum Borrowing Capacity               $ 4,000,000.0    
Revolving Credit Facility [Member] | American Bank & Trust [Member]                    
Interest Expense, Total                 $ 0 $ 0
Debt Obligations [Member]                    
Long-Term Debt, Weighted Average Interest Rate, at Point in Time                 1.20% 1.30%
Federal Home Loan Bank of Chicago [Member]                    
Debt Instrument, Collateral Amount                 $ 18,200,000  
Federal Home Loan Bank, Advances, General Debt Obligations, Maximum Amount Available                 $ 44,300,000  
Line of Credit Facility Maximum Borrowing Capacity Percent                 25.00%  
Federal Home Loan Bank of Chicago [Member] | Federal Home Loan Bank Advances, One [Member]                    
Debt Instrument, Term (Year)           5 years        
Debt Instrument, Interest Rate, Stated Percentage           1.40%        
Proceeds from FHLBank Borrowings, Financing Activities           $ 6,000,000.0        
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged           $ 6,800,000        
Federal Home Loan Bank of Chicago [Member] | Federal Home Loan Bank Advances, Two [Member]                    
Debt Instrument, Term (Year)     5 years              
Debt Instrument, Interest Rate, Stated Percentage     0.74%              
Proceeds from FHLBank Borrowings, Financing Activities         $ 4,000,000.0          
Federal Home Loan Bank of Chicago [Member] | FHLBC May 2021 [Member]                    
Debt Instrument, Term (Year)       1 year            
Debt Instrument, Interest Rate, Stated Percentage       0.00%            
Debt Instrument, Collateral Amount       $ 5,000,000.0            
Federal Home Loan Bank of Chicago [Member] | FHLBC May 2021 Loan [Member]                    
Debt Instrument, Face Amount   $ 5,000,000.0                
Debt Instrument, Term (Year)   5 years                
Debt Instrument, Interest Rate, Stated Percentage   1.36%                
Loans Payable [Member]                    
Debt Instrument, Face Amount             $ 3,500,000      
Debt Instrument, Term (Year)             5 years      
Debt Instrument, Interest Rate, Stated Percentage             3.65%      
Debt Instrument, Collateral Amount             $ 1,000,000.0      
Repayments of Long-Term Debt, Total $ 3,500,000