| PERKINS CAPITAL MANAGEMENT INC | 66,033 | $1,783 | 1.77% |
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| Ulland Investment Advisors, LLC | 56,461 | $1,524 | 1.68% |
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| Global Alpha Capital Management Ltd. | 561,050 | $15,148,350 | 1.52% |
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| Conestoga Capital Advisors, LLC | 3,080,925 | $83,184,975 | 1.43% |
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| ESSEX INVESTMENT MANAGEMENT CO LLC | 257,701 | $6,957,927 | 1.14% |
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| Summit Creek Advisors LLC | 255,256 | $6,891,912 | 0.94% |
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| PUNCH & ASSOCIATES INVESTMENT MANAGEMENT, INC. | 436,286 | $11,779,715 | 0.75% |
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| Vahanian & Associates Financial Planning Inc. | 8,485 | $229,095 | 0.74% |
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| GENEVA CAPITAL MANAGEMENT LLC | 930,660 | $25,127,814 | 0.53% |
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| OBERWEIS ASSET MANAGEMENT INC/ | 161,100 | $4,349,700 | 0.46% |
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| MAIRS & POWER INC | 1,012,214 | $27,329,778 | 0.32% |
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| EARNEST PARTNERS LLC | 1,908,943 | $51,541,461 | 0.30% |
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| ROYCE & ASSOCIATES LP | 913,973 | $24,677,271 | 0.25% |
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| DRIEHAUS CAPITAL MANAGEMENT LLC | 706,681 | $19,080,387 | 0.25% |
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| HMS Capital Management, LLC | 8,517 | $229,959 | 0.15% |
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| GLOBEFLEX CAPITAL L P | 43,719 | $1,180,413 | 0.14% |
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| Wellington Shields & Co., LLC | 18,463 | $498,501 | 0.12% |
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| Dorsey & Whitney Trust CO LLC | 52,496 | $1,417,392 | 0.12% |
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| FORT WASHINGTON INVESTMENT ADVISORS INC /OH/ | 527,007 | $14,229,189 | 0.11% |
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| Legato Capital Management LLC | 25,480 | $687,960 | 0.10% |
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