Note 2 - Revenues (Details Textual) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2023	Dec. 31, 2022
Revenue from Contract with Customer, Including Assessed Tax	$ 46,598	$ 57,163	$ 50,843	$ 48,873	$ 40,060	$ 44,843	$ 50,012	$ 41,844	$ 203,477	$ 176,759
Transferred over Time [Member] | Gearing [Member]
Revenue from Contract with Customer, Including Assessed Tax									5,370
Transferred over Time [Member] | Heavy Fabrications [Member]
Revenue from Contract with Customer, Including Assessed Tax									$ 11,033	$ 15,117