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Note 1 - Summary of Significant Accounting Policies (Details Textual)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended 42 Months Ended
Jul. 08, 2020
USD ($)
Apr. 30, 2018
USD ($)
Jun. 30, 2021
USD ($)
Mar. 31, 2021
USD ($)
Dec. 31, 2021
USD ($)
$ / shares
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Mar. 31, 2018
USD ($)
Apr. 01, 2024
USD ($)
Sep. 30, 2021
Mar. 21, 2021
USD ($)
Sep. 30, 2020
USD ($)
Apr. 01, 2020
USD ($)
Number of Reportable Segments         4              
Insurance Policy Primary Occurence Limit         $ 7,000         $ 9,000    
Insurance Policy Excess Coverage         3,000         1,000    
Insurance Policy Excess Coverage         3,000         $ 1,000    
Insurance Policy, Fixed Premium Expense                       $ 400
Proceeds from Divestiture of Businesses         0 $ 108,375            
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax, Total         3,412 (40,431)            
Disposal Group, Including Discontinued Operation, Contingent Liabilities         5,100 44,151            
Repayments of Lines of Credit         695,513 1,326,678            
Disposal Group, Including Discontinued Operation, Other Liabilities, Noncurrent         5,100 44,151            
Contract with Customer, Liability, Revenue Recognized         400 1,200            
Accounts Receivable, after Allowance for Credit Loss, Total         142,400 91,300            
Depreciation, Depletion and Amortization, Nonproduction, Total         53,881 65,472            
Net Income (Loss) Attributable to Parent, Total         $ 60,731 $ (42,718)            
Earnings Per Share, Diluted, Total (in dollars per share) | $ / shares         $ 3.57 $ (2.46)            
Impairment of Long-Lived Assets Held-for-use         $ 0 $ 26,569            
Finite-Lived Intangible Asset, Useful Life (Year)         102 months 105 months            
Workers Compensation Self Insurance Per Claim         $ 1,300              
Cargo Losses Purchased Coverage per Claim         300              
Employee Annual Insuarnce Deductible Per Claim         $ 400              
Physical Damage Coverage         100.00%              
Drivers Advances and Other Receivables Net Of Allowance         $ 8,792 $ 13,624            
Liability for Claims and Claims Adjustment Expense, Single Loss Limit   $ 9,000                    
Liability for Claims and Claims Adjustment Expense, Aggregate Limit per Policy Year   18,000                    
Liability for Claims and Claims Adjustment Expense, Aggregate Three Year Limit   30,000                    
Auto Policy Release Premium Refund   $ 14,000         $ 7,300          
Interest Costs Capitalized         $ 100 $ 100            
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures, Total (in shares) | shares         374,000 195,000            
Antidilutive Securities Excluded from Computation of Earnings Per Share Because the Performance Targets Were Not Achieved , Amount (in shares) | shares         157,000 34,000            
Share-based Payment Arrangement, Option [Member]                        
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture, Total (in shares) | shares         158,000 70,000            
Restricted Stock [Member]                        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) | shares         0 195,000            
Employee Stock Options [Member]                        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) | shares         124,000 195,000            
Receivables from Insurers [Member]                        
Drivers Advances and Other Receivables Net Of Allowance         $ 0 $ 0            
Insurance Settlements Receivable, Current         900 7,400            
Insurance Settlements Receivable, Noncurrent         $ 6,500 $ 24,400            
Minimum [Member]                        
Finite-Lived Intangible Asset, Useful Life (Year)         3 years              
Maximum [Member]                        
Finite-Lived Intangible Asset, Useful Life (Year)         15 years              
Tractors [Member]                        
Property, Plant and Equipment, Useful Life (Year)         5 years              
Tractors [Member] | Minimum [Member]                        
Property, Plant and Equipment, Salvage Value, Percentage         10.00%              
Tractors [Member] | Maximum [Member]                        
Property, Plant and Equipment, Salvage Value, Percentage         35.00%              
Refrigerated Trailers [Member]                        
Property, Plant and Equipment, Useful Life (Year)         7 years              
Dry Van Trailers [Member]                        
Property, Plant and Equipment, Useful Life (Year)         10 years              
Dry Van Trailers [Member] | Minimum [Member]                        
Property, Plant and Equipment, Salvage Value, Percentage         28.00%              
Dry Van Trailers [Member] | Maximum [Member]                        
Property, Plant and Equipment, Salvage Value, Percentage         21.00%              
Revenue Equipment [Member] | Minimum [Member]                        
Property, Plant and Equipment, Useful Life (Year)         3 years              
Capital Leases of Lessee, Term of Contract (Month)         48 months 48 months            
Revenue Equipment [Member] | Maximum [Member]                        
Property, Plant and Equipment, Useful Life (Year)         10 years              
Capital Leases of Lessee, Term of Contract (Month)         84 months 84 months            
Intangible Assets, Amortization Period [Member]                        
Depreciation, Depletion and Amortization, Nonproduction, Total           $ 3,200            
Net Income (Loss) Attributable to Parent, Total           $ (2,500)            
Earnings Per Share, Diluted, Total (in dollars per share) | $ / shares           $ (0.14)            
Customer Concentration Risk [Member] | Revenue Benchmark [Member]                        
Number of Major Customers         10,000,000 10,000,000            
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Ten Customers [Member]                        
Concentration Risk, Percentage         53.00% 48.00%            
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | One Customer [Member]                        
Number of Major Customers         0 1            
TBK Bank [Member] | Draw Note [Member]                        
Repayments of Lines of Credit     $ 31,000                  
Transport Financial Services [Member] | Discontinued Operations, Held-for-sale [Member]                        
Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net $ 103,300                      
Disposal Group, Including Discontinued Operation, Consideration 122,300                   $ 108,400  
Proceeds from Divestiture of Businesses 108,400                      
Disposal Group, Including Discontinued Operation, Consideration, Equity Interest Acquired 13,900                      
Disposal Group, Including Discontinued Operation, Earnout Opportuntiy, Maximum 9,900                      
Disposal Group Including Discontinued Operation, Dispute over Nature of Assets 66,000                      
Disposal Group, Including Discontinued Operation, Consideration Returned upon Settlement         $ 28,100              
Disposal Group Including Discontinued Operation, Assets Advances Against Future Payments For Services Not Yet Performed 62,000                      
Disposal Group Including Discontinued Operation, Indemnity, Loss Amount $ 30,000                      
Disposal Group Including Discontinued Operation, Indemnity, Percentage of Next 30 Million Loss 50.00%                      
Disposal Group Including Discontinued Operation, Total Indemnification $ 45,000                      
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax, Total 3,700                      
Disposal Group, Including Discontinued Operation, Contingent Liabilities           $ 44,200            
Transport Financial Services [Member] | Discontinued Operations, Disposed of by Sale [Member]                        
Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net $ 103,300                      
Discontinued Operation, Amount of Continuing Cash Flows after Disposal       $ (35,600)                
Discontinued Operation, Amount of Adjustment to Prior Period Gain (Loss) on Disposal, Net of Tax, Total       $ 3,400 3,412 $ (44,151)            
Disposal Group, Including Discontinued Operation, Other Liabilities, Noncurrent         $ 5,100              
Forecast [Member]                        
Insurance Policy Primary Occurence Limit               $ 7,000        
Insurance Policy Excess Coverage               3,000        
Insurance Policy Excess Coverage               $ 3,000        
Transport Enterprise Leasing LLC [Member]                        
Equity Method Investment, Ownership Percentage         49.00%       49.00%