Note 15 - Concentrations	12 Months Ended
Dec. 31, 2022
Notes to Financial Statements
Concentration Risk Disclosure [Text Block]	15. CONCENTRATIONS During 2022, 75% of revenues were derived from four customers that individually had over 10% of our total revenues: Customer 1 with 27%, Customer 2 with 23%, Customer 3 with 15% and customer 4 with 10%. During 2021, 26% of revenues were derived from two customers that individually had over 10% of our total revenues: Customer 2 with 11% and Customer 3 with 15%. The Company’s major product lines in 2022 and 2021 were electric power transmission and distribution maintenance and service, utility-scale solar construction projects and telecommunications maintenance and services. At December 31, 2022, of the gross trade accounts receivable totaling approximately $53.4 million, four individual customers made up approximately 72% of the Company's total trade accounts receivable: Customer 1 at 11%. Customer 2 at 26%, Customer 3 at 14% and Customer 4 at 21%. At December 31, 2021, of the gross trade accounts receivable totaling approximately $50.2 million, two individual customers made up approximately 46% of the Company's total trade accounts receivable: Customer 1 at 16% and Customer 2 at 30%. For the 12 months ended December 31, 2022, there were no supplier concentrations. For the 12 months ended December 31, 2021, there was one supplier concentration of approximately 12%. For the years ended December 31, 2022 and 2021, the Company had no foreign revenue concentrations or foreign trade accounts receivable concentrations outside the United States. As of December 31, 2022 and 2021, 13% and 15%, respectively, of the Company's total labor force was subject to a collective bargaining agreement.

Note 15 - Concentrations

12 Months Ended

Dec. 31, 2022

Concentration Risk Disclosure [Text Block]

15. CONCENTRATIONS

During 2022, 75% of revenues were derived from four customers that individually had over 10% of our total revenues: Customer 1 with 27%, Customer 2 with 23%, Customer 3 with 15% and customer 4 with 10%. During 2021, 26% of revenues were derived from two customers that individually had over 10% of our total revenues: Customer 2 with 11% and Customer 3 with 15%.

The Company’s major product lines in 2022 and 2021 were electric power transmission and distribution maintenance and service, utility-scale solar construction projects and telecommunications maintenance and services.

At December 31, 2022, of the gross trade accounts receivable totaling approximately $53.4 million, four individual customers made up approximately 72% of the Company's total trade accounts receivable: Customer 1 at 11%. Customer 2 at 26%, Customer 3 at 14% and Customer 4 at 21%. At December 31, 2021, of the gross trade accounts receivable totaling approximately $50.2 million, two individual customers made up approximately 46% of the Company's total trade accounts receivable: Customer 1 at 16% and Customer 2 at 30%.

For the 12 months ended December 31, 2022, there were no supplier concentrations. For the 12 months ended December 31, 2021, there was one supplier concentration of approximately 12%.

For the years ended December 31, 2022 and 2021, the Company had no foreign revenue concentrations or foreign trade accounts receivable concentrations outside the United States.

As of December 31, 2022 and 2021, 13% and 15%, respectively, of the Company's total labor force was subject to a collective bargaining agreement.