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Note 1 - Overview and Summary of Significant Accounting Policies (Details Textual)
shares in Thousands, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 12, 2022
USD ($)
Feb. 28, 2022
USD ($)
Feb. 21, 2022
USD ($)
Jan. 24, 2022
USD ($)
Jan. 19, 2022
USD ($)
Mar. 31, 2023
USD ($)
shares
Mar. 31, 2022
USD ($)
shares
Dec. 31, 2022
USD ($)
Number of Franchisee Owned Offices           440    
Number of States in which Entity Operates           38    
Number of Employees           85,000    
Gain (Loss), Foreign Currency Transaction, after Tax           $ 0 $ 0  
Accounts Receivable, Allowance for Credit Loss           $ 84   $ 70
Royalty Fees, Percentage of Payroll           4.50%    
Revenue, Percentage of Gross Margin           18.00%    
License Fee, Percentage of Gross Margin           9.00%    
Financing Receivable, Allowance for Credit Loss           $ 260   260
Impairment of Intangible Assets (Excluding Goodwill), Total           $ 0   $ 0
Common, Equivalent Shares, Outstanding (in shares) | shares           192 267  
Minimum [Member]                
Percentage of Sales for Services           6.00%    
Royalty Fees, Percentage of Contractor Payments           4.00%    
Finite-Lived Intangible Asset, Useful Life (Year)           5 years    
Minimum [Member] | MRI Franchise [Member]                
Royalty Fees, Percentage of Payroll           20.00%    
Minimum [Member] | Franchise [Member]                
Percentage of Sales for Services           5.00%    
Maximum [Member]                
Percentage of Sales for Services           8.00%    
Royalty Fees, Percentage of Contractor Payments           10.00%    
Finite-Lived Intangible Asset, Useful Life (Year)           15 years    
Maximum [Member] | MRI Franchise [Member]                
Royalty Fees, Percentage of Payroll           25.00%    
Maximum [Member] | Franchise [Member]                
Percentage of Sales for Services           8.00%    
Temporary Alternatives [Member]                
Significant Changes, Franchises Purchased During Period       3        
Business Combination, Consideration Transferred, Total       $ 7,043        
Business Combination, Consideration Transferred, Liabilities Incurred       $ 336        
Dubin [Member]                
Business Combination, Consideration Transferred, Total     $ 2,462   $ 2,500      
Business Combination, Consideration Transferred, Liabilities Incurred     362          
Dubin [Member] | Adjusted Net Working Capital Payable [Member]                
Business Combination, Consideration Transferred, Liabilities Incurred     62          
Dubin [Member] | Notes Payable, Other Payables [Member]                
Business Combination, Consideration Transferred, Liabilities Incurred     $ 300          
Northbound [Member]                
Business Combination, Consideration Transferred, Total   $ 11,428            
Northbound [Member] | Adjusted Net Working Capital Payable [Member]                
Business Combination, Consideration Transferred, Liabilities Incurred   328            
Northbound [Member] | Notes Payable, Other Payables [Member]                
Business Combination, Consideration Transferred, Liabilities Incurred   $ 1,500            
MRINetwork [Member]                
Business Combination, Consideration Transferred, Total $ 13,283              
MRINetwork [Member] | Adjusted Net Working Capital Payable [Member]                
Business Combination, Consideration Transferred, Liabilities Incurred 223              
MRINetwork [Member] | Contingent Consideration Liability [Member]                
Business Combination, Consideration Transferred, Liabilities Incurred $ 60