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Note 11 - Stockholder's Equity (Details Textual) - USD ($) |  |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
Apr. 03, 2017 | May 09, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Proceeds from Issuance of Common Stock |  |  |  |  |  | $ 19,144,000
Allocated Share-based Compensation Expense |  |  | $ 1,400,000 | $ 400,000 | 2,000,000 | 800,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized |  |  | $ 1,500,000 | $ 2,700,000 | $ 1,500,000 | $ 2,700,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition |  |  |  |  | 2 years 73 days |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number |  |  | 500,000 |  | 500,000 |
Former Chief Executive Officer [Member] |  |  |  |  |  |
Allocated Share-based Compensation Expense |  |  | $ 700,000 |  | $ 700,000 |
Restricted Stock [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |  |  | 102,571 |  | 166,410 |
Warrants to the Lenders Under the Loan Agreement [Member] |  |  |  |  |  |
Share Price | $ 8.88 |  |  |  |  |
Warrants and Rights Outstanding | $ 3,500,000 |  | $ 3,500,000 |  | $ 3,500,000 |
Warrants to the Lenders Under the Loan Agreement [Member] | Loan and Security Agreement [Member] |  |  |  |  |  |
Class of Warrant or Right, Term | 5 years |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | 1,000,000 |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ 10.25 |  |  |  |  |
D.A. Davidson and Co. [Member] |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  | 5,175,000 |  |  |  |
Share Price |  | $ 4 |  |  |  |
Share Price, Net |  | $ 3.77 |  |  |  |
Proceeds from Issuance of Common Stock |  | $ 19,100,000 |  |  |  |
Tealstone Construction [Member] |  |  |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | 1,882,058 |  |  |  |  |
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable | $ 17,061,000 |  |  |  |  |

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