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Note 12 - Subsequent Events (Details Textual)
Apr. 03, 2020
USD ($)
Apr. 03, 2019
USD ($)
Apr. 03, 2017
USD ($)
$ / shares
shares
Subsequent Event [Member] | Loan and Security Agreement [Member] | Warrants to the Lenders Under the Loan Agreement [Member]      
Class of Warrant or Right, Term     5 years
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares     1,000,000
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares     $ 10.25
Subsequent Event [Member] | Wilmington Trust, National Association [Member] | Loan and Security Agreement [Member] | Senior Secured Term Loans [Member]      
Debt Instrument, Face Amount     $ 85,000,000
Loan Prepayment Offer Required to Make Quarterly, Percentage     75.00%
Debt Instrument, Financial Covenants, Maximum Ratio of Secured Indebtedness to EBITDA, Period One     3.1
Debt Instrument, Financial Covenants, Maximum Ratio of Secured Indebtedness to EBITDA, Period Two     0.018
Debt Instrument, Financial Covenants, Minimum Daily Cash Collateral, Period One     $ 10,000,000
Debt Instrument, Financial Covenants, Minimum Daily Cash Collateral, Period Two     15,000,000
Debt Instrument, Financial Covenants, Minimum Daily Cash Collateral, Potential Additional Period     18,000,000
Debt Instrument, Financial Covenants, Minimum Rolling Four Quarter Gross Margin in Contract Backlog, Period One     60,000,000
Debt Instrument, Financial Covenants, Minimum Rolling Four Quarter Gross Margin in Contract Backlog, Period Two     70,000,000
Debt Instrument, Financial Covenants, Maximum Incurrence of Net Capital Expenditures During Each of Four Consecutive Fiscal Quarters     15,000,000
Debt Instrument, Financial Covenants, Minimum Bonding Capacity     1,000,000,000
Subsequent Event [Member] | Wilmington Trust, National Association [Member] | Loan and Security Agreement [Member] | Senior Secured Term Loans [Member] | Tealstone Residential Concrete, Inc. [Member]      
Debt Instrument, Financial Covenants, Minimum EBITDA During Each Four Consecutive Fiscal Quarters     $ 12,000,000
Subsequent Event [Member] | Wilmington Trust, National Association [Member] | Loan and Security Agreement [Member] | Senior Secured Term Loans [Member] | London Interbank Offered Rate (LIBOR) [Member]      
Debt Instrument, Basis Spread on Variable Rate     8.75%
Tealstone Construction [Member] | Scenario, Forecast [Member]      
Payments to Acquire Businesses, Gross $ 7,500,000 $ 2,500,000  
Tealstone Construction [Member] | Subsequent Event [Member]      
Business Acquisition, Percentage of Voting Interests Acquired     100.00%
Payments to Acquire Businesses, Gross     $ 55,000,000
Business Combination, Consideration Transferred, Liabilities Incurred     4,400,000
Business Combination, Contingent Consideration, Liability     15,000,000
Business Combination, Consideration Transferred     $ 83,700,000
Fair Value Inputs, Discount Rate     12.00%
Tealstone Construction [Member] | Subsequent Event [Member] | Common Stock [Member]      
Stock Issued During Period, Shares, Acquisitions | shares     1,882,058