More than a half-dozen tri-state workers have been affected by the closure of a national company with a location in Dyersville. Frozen meal delivery service Yelloh, formerly known as Schwan’s, recently announced its intent to permanently close this fall due to “insurmountable” business challenges. Per a notice filed with Iowa Workforce Development, the closure will result in the layoff of eight Dyersville employees effective Nov. 22 — one small portion of the 1,100 affected employees nationwide.