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Note 2 - Tealstone Acquisition (Details Textual) - USD ($)
 3 Months Ended 6 Months Ended
Apr. 03, 2020
Apr. 03, 2019
Apr. 03, 2017
Jun. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Goodwill       $ 90,971,000 $ 90,971,000 $ 54,820,000
Common Stock [Member]            
Stock Issued During Period, Shares, Acquisitions         1,882,000  
Tealstone Construction [Member]            
Business Acquisition, Percentage of Voting Interests Acquired     100.00%      
Payments to Acquire Businesses, Gross     $ 55,000,000      
Business Combination, Consideration Transferred, Liabilities Incurred     4,436,000      
Business Combination, Contingent Consideration, Liability     15,000,000      
Business Combination, Consideration Transferred     $ 83,708,000      
Fair Value Inputs, Discount Rate     12.00%      
Goodwill     $ 36,200,000 90,971,000 $ 90,971,000 $ 54,820,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill     $ 40,000,000      
Amortization of Intangible Assets       500,000    
Goodwill, Purchase Accounting Adjustments, With 10% Change in Valuation of Intangible Assets       4,000,000    
Business Combination, Provisional Information, Amortization Expense Adjustment, With 10% Change in Valuation of Intangible Assets       $ 200,000    
Tealstone Construction [Member] | Scenario, Forecast [Member]            
Payments to Acquire Businesses, Gross $ 7,500,000 $ 2,500,000        
Tealstone Construction [Member] | Common Stock [Member]            
Stock Issued During Period, Shares, Acquisitions     1,882,058