Small business by definition in the US is much larger than you'd think. IIRC, it's under 250 employees and under $40M in annual revenue.
Enterprises can be classified in different categories according to their size; for this purpose, different criteria may be used, but the most common is number of people employed. In small and medium-sized enterprises (SMEs) employ fewer than 250 people. SMEs are further subdivided into micro enterprises (fewer than 10 employees), small enterprises (10 to 49 employees), medium-sized enterprises (50 to 249 employees). Large enterprises employ 250 or more people